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Cerebrospinal fluid
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This article uses anatomical terminology; for an overview, see Anatomical terminology.
Cerebrospinal fluid
The cerebrospinal fluid (CSF) circulates in the subarachnoid space around the brain and spinal cord
Image showing the location of CSF highlighting the brain's ventricular system
Details
Identifiers
Latin
liquor cerebrospinalis
Acronym(s)
CSF
MeSH
D002555
TA
A14.1.01.203
FMA
20935
Anatomical terminology
[edit on Wikidata]
Cerebrospinal fluid (CSF) is a clear, colorless body fluid found in the brain and spinal cord. It is produced by the specialised ependymal cells in the choroid plexuses of the ventricles of the brain, and absorbed in the arachnoid granulations. There is about 125mL of CSF at any one time, and about 500mL is generated every day. CSF acts as a cushion or buffer for the brain, providing basic mechanical and immunological protection to the brain inside the skull. CSF also serves a vital function in cerebral autoregulation of cerebral blood flow.
CSF occupies the subarachnoid space (between the arachnoid mater and the pia mater) and the ventricular system around and inside the brain and spinal cord. It fills the ventricles of the brain, cisterns, and sulci, as well as the central canal of the spinal cord. There is also a connection from the subarachnoid space to the bony labyrinth of the inner ear via the perilymphatic duct where the perilymph is continuous with the cerebrospinal fluid.
A sample of CSF can be taken via lumbar puncture. This can reveal the intracranial pressure, as well as indicate diseases including infections of the brain or its surrounding meninges. Although noted by Hippocrates, it was only in the 18th century that Emanuel Swedenborg is credited with its rediscovery, and as late as 1914 that Harvey W. Cushing demonstrated CSF was secreted by the choroid plexus.
Contents
[hide]
1 Structure
1.1 Circulation
1.2 Contents
2 Development
3 Physiology
3.1 Function
3.2 Production
3.3 Reabsorption
3.4 Regulation
4 Clinical significance
4.1 Pressure
4.2 CSF leak
4.3 Lumbar puncture
4.4 Anaesthesia and chemotherapy
5 History
6 Other animals
7 See also
8 References
9 External links
Structure[edit]
Circulation[edit]
MRI showing pulsation of CSF
Distribution of CSF
There is about 125-150 mL of CSF at any one time.[1] This CSF circulates within the ventricular system of the brain. The ventricles are a series of cavities filled with CSF. The majority of CSF is produced from within the two lateral ventricles. From here, CSF passes through the interventricular foramina to the third ventricle, then the cerebral aqueduct to the fourth ventricle. From the fourth ventricle, the fluid passes into the subarachnoid space through four openings – the central canal of the spinal cord, the median aperture, and the two lateral apertures.[1] CSF is present within the subarachnoid space, which covers the brain, spinal cord, and stretches below the end of the spinal cord to the sacrum.[1][2] There is a connection from the subarachnoid space to the bony labyrinth of the inner ear making the cerebrospinal fluid continuous with the perilymph in 93% of people.[3]
CSF moves in a single outward direction from the ventricles, but multidirectionally in the subarachnoid space.[3] Fluid movement is pulsatile, matching the pressure waves generated in blood vessels by the beating of the heart.[3] Some authors dispute this, posing that there is no unidirectional CSF circulation, but cardiac cycle-dependent bi-directional systolic-diastolic to-and-fro cranio-spinal CSF movements.[4]
Contents[edit]
CSF is derived from blood plasma and is largely similar to it, except that CSF is nearly protein-free compared with plasma and has some different electrolyte levels. Due to the way it is produced, CSF has a higher chloride level than plasma, and an equivalent sodium level.[2][5]
CSF contains approximately 0.3% plasma proteins, or approximately 15 to 40 mg/dL, depending on sampling site.[6] In general, globular proteins and albumin are in lower concentration in ventricular CSF compared to lumbar or cisternal fluid.[7] This continuous flow into the venous system dilutes the concentration of larger, lipid-insoluble molecules penetrating the brain and CSF.[8] CSF is normally free of red blood cells, and at most contains only a few white blood cells. Any white blood cell count higher than this constitutes pleocytosis.[9]
Development[edit]
At around the third week of development, the embryo is a three-layered disc, covered with ectoderm, mesoderm and endoderm. A tube-like formation develops in the midline, called the notochord. The notochord releases extracellular molecules that affect the transformation of the overlying ectoderm into nervous tissue.[10] The neural tube, forming from the ectoderm, contains CSF prior to the development of the choroid plexuses.[3] The open neuropores of the neural tube close after the first month of development, and CSF pressure gradually increases.[3]
As the brain develops, by the fourth week of embryological development three swellings have formed within the embryo around the canal, near where the head will develop. These swellings represent different components of the central nervous system: the prosencephalon, mesencephalon and rhombencephalon.[10] Subarachnoid spaces are first evident around the 32nd day of development near the rhombencephalon; circulation is visible from the 41st day.[3] At this time, the first choroid plexus can be seen, found in the fourth ventricle, although the time at which they first secrete CSF is not yet known.[3]
The developing forebrain surrounds the neural cord. As the forebrain develops, the neural cord within it becomes a ventricle, ultimately forming the lateral ventricles. Along the inner surface of both ventricles, the ventricular wall remains thin, and a choroid plexus develops, producing and releasing CSF.[10] CSF quickly fills the neural canal.[10] Arachnoid villi are formed around the 35th week of development, with aracnhoid granulations noted around the 39th, and continuing developing until 18 months of age.[3]
The subcommissural organ secretes SCO-spondin, which forms Reissner's fiber within CSF assisting movement through the cerebral aqueduct. It is present in early intra-uterine life but disappears during early development.[3]
Physiology[edit]
Function[edit]
CSF serves several purposes:
Buoyancy: The actual mass of the human brain is about 1400–1500 grams; however, the net weight of the brain suspended in CSF is equivalent to a mass of 25-50 grams.[11][1] The brain therefore exists in neutral buoyancy, which allows the brain to maintain its density without being impaired by its own weight, which would cut off blood supply and kill neurons in the lower sections without CSF.[5]
Protection: CSF protects the brain tissue from injury when jolted or hit, by providing a fluid buffer that acts as a shock absorber from some forms of mechanical injury.[1][5]
Prevention of brain ischemia: The prevention of brain ischemia is made by decreasing the amount of CSF in the limited space inside the skull. This decreases total intracranial pressure and facilitates blood perfusion.[1]
Homeostasis: CSF allows for regulation of the distribution of substances between cells of the brain,[3] and neuroendocrine factors, to which slight changes can cause problems or damage to the nervous system. For example, high glycine concentration disrupts temperature and blood pressure control, and high CSF pH causes dizziness and syncope.[5]
Clearing waste: CSF allows for the removal of waste products from the brain,[1] and is critical in the brain's lymphatic system.[12] Metabolic waste products diffuse rapidly into CSF and are removed into the bloodstream as CSF is absorbed.[13]
Production[edit]
Comparison of Average Serum and Cerebrospinal Fluid
Substance
CSF
Serum
Water Content (%) 99 93
Protein (mg/dL) 35 7000
Glucose (mg/dL) 60 90
Osmolarity (mOsm/L) 295 295
Sodium (mEq/L) 138 138
Potassium (mEq/L) 2.8 4.5
Calcium (mEq/L) 2.1 4.8
Magnesium (mEq/L) 2.0–2.5[14] 1.7
Chloride (mEq/L) 119 102
pH 7.33 7.41
The brain produces roughly 500 mL of cerebrospinal fluid per day,[2] at a rate of about 25 mL an hour.[1] This transcellular fluid is constantly reabsorbed, so that only 125–150 mL is present at any one time.[1]
Most (about two-thirds to 80%) of CSF is produced by the choroid plexus.[1][2] The choroid plexus is a network of blood vessels present within sections of the four ventricles of the brain. It is present throughout the ventricular system except for the cerebral aqueduct, frontal horn of the lateral ventricle, and occipital horn of the lateral ventricle.[15] CSF is also produced by the single layer of column-shaped ependymal cells which line the ventricles; by the lining surrounding the subarachnoid space; and a small amount directly from the tiny spaces surrounding blood vessels around the brain.[2]
CSF is produced by the choroid plexus in two steps. Firstly, a filtered form of plasma moves from fenestrated capillaries in the choroid plexus into an interstitial space,[1] with movement guided by a difference in pressure between the blood in the capillaries and the interstitial fluid.[3] This fluid then needs to pass through the epithelium cells lining the choroid plexus into the ventricles, an active process requiring the transport of sodium, potassium and chloride that draws water into CSF by creating osmotic pressure.[3] Unlike blood passing from the capillaries into the choroid plexus, the epithelial cells lining the choroid plexus contain tight junctions between cells, which act to prevent most substances flowing freely into CSF.[16]
Water and carbon dioxide from the interstitial fluid diffuse into the epithelial cells. Within these cells, carbonic anhydrase converts the substances into bicarbonate and hydrogen ions. These are exchanged for sodium and chloride on the cell surface facing the interstitium.[3] Sodium, chloride, bicarbonate and potassium are then actively secreted into the ventricular lumen.[2][3] This creates osmotic pressure and draws water into CSF,[2] facilitated by aquaporins.[3] Chloride, with a negative charge, moves with the positively charged sodium, to maintain electroneutrality.[2] Potassium and bicarbonate are also transported out of CSF.[2] As a result, CSF contains a higher concentration of sodium and chloride than blood plasma, but less potassium, calcium and glucose and protein.[5] Choroid plexuses also secrete growth factors, vitamins B1, 12 C, folate, beta-2 microglobulin, arginine vasopressin and nitrous oxide into CSF.[3] A Na-K-Cl cotransporter and Na/K ATPase found on the surface of the choroid endothelium, appears to play a role in regulating CSF secretion and composition.[3][1]
Orešković and Klarica hypothesise that CSF is not primarily produced by the choroid plexus, but is being permanently produced inside the entire CSF system, as a consequence of water filtration through the capillary walls into the interstitial fluid of the surrounding brain tissue, regulated by AQP-4.[4]
There are circadian variations in CSF secretion, with the mechanisms not fully understood, but potentially relating to differences in the activation of the autonomic nervous system over the course of the day.[3]
Reabsorption[edit]
CSF returns to the vascular system by entering the dural venous sinuses via arachnoid granulations.[2] These are outpouchings of the arachnoid mater into the venous sinuses around the brain, with valves to ensure one-way drainage.[2] This occurs because of a pressure difference between the arachnoid mater and venous sinuses.[3] CSF has also been seen to drain into lymphatic vessels,[17] particularly those surrounding the nose via drainage along the olfactory nerve through the cribriform plate. The pathway and extent are currently not known,[1] but may involve CSF flow along some cranial nerves and be more prominent in the neonate.[3] CSF turns over at a rate of three to four times a day.[2] CSF has also been seen to be reabsorbed through the sheathes of cranial and spinal nerve sheathes, and through the ependyma.[3]
Regulation[edit]
The composition and rate of CSF generation are influenced by hormones and the content and pressure of blood and CSF.[3] For example, when CSF pressure is higher, there is less of a pressure difference between the capillary blood in choroid plexuses and CSF, decreasing the rate at which fluids move into the choroid plexus and CSF generation.[3] The autonomic nervous system influences choroid plexus CSF secretion, with activation of the sympathetic nervous system increasing secretion and the parasympathetic nervous system decreasing it.[3] Changes in the pH of the blood can affect the activity of carbonic anhydrase, and some drugs (such as frusemide, acting on the Na-K-Cl cotransporter) have the potential to impact membrane channels.[3]
Clinical significance[edit]
Pressure[edit]
CSF pressure, as measured by lumbar puncture, is 10–18 cmH2O (8–15 mmHg or 1.1–2 kPa) with the patient lying on the side and 20–30 cmH2O (16–24 mmHg or 2.1–3.2 kPa) with the patient sitting up.[18] In newborns, CSF pressure ranges from 8 to 10 cmH2O (4.4–7.3 mmHg or 0.78–0.98 kPa). Most variations are due to coughing or internal compression of jugular veins in the neck. When lying down, the CSF pressure as estimated by lumbar puncture is similar to the intracranial pressure.
Hydrocephalus is an abnormal accumulation of CSF in the ventricles of the brain.[19] Hydrocephalus can occur because of obstruction of the passage of CSF, such as from an infection, injury, mass, or congenital abnormality.[19][20] Hydrocephalus without obstruction associated with normal CSF pressure may also occur.[19] Symptoms can include problems with gait and coordination, urinary incontinence, nausea and vomiting, and progressively impaired thinking.[20] In infants, hydrocephalus can cause an enlarged head, as the bones of the skull have not yet fused, seizures, irritability and drowsiness.[20] A CT scan or MRI scan may reveal enlargement of one or both lateral ventricles, or causative masses or lesions,[19][20] and lumbar puncture may be used to demonstrate and in some circumstances relieve high intracranial pressure.[21] Hydrocephalus is usually treated through the insertion of a shunt, which diverts fluid to another part of the body, such as a ventriculo-peritoneal shunt.[19][20]
Idiopathic intracranial hypertension is a condition of unknown cause characterised by a rise in CSF pressure. It is associated with headaches, double vision, difficulties seeing, and a swollen optic disc.[19] It can occur in association with the use of Vitamin A and tetracycline antibiotics, or without any identifiable cause at all, particularly in younger obese women.[19] Management may include ceasing any known causes, a carbonic anhydrase inhibitor such as acetazolamide, repeated drainage via lumbar puncture, or the insertion of a shunt such as a ventriculoperitoneal shunt.[19]
CSF leak[edit]
CSF can leak from the dura as a result of different causes such as physical trauma or a lumbar puncture, or from no known cause when it is termed spontaneous cerebrospinal fluid leak.[22] It is usually associated with intracranial hypotension: low CSF pressure.[21] It can cause headaches, made worse by standing, moving and coughing,[21] as the low CSF pressure causes the brain to "sag" downwards and put pressure on its lower structures.[21] If a leak is identified, a beta-2 transferrin test of the leaking fluid, when positive, is highly specific and sensitive for the detection for CSF leakage.[22] Medical imaging such as CT scans and MRI scans can be used to investigate for a presumed CSF leak when no obvious leak is found but low CSF pressure is identified.[23] Caffeine, given either orally or intravenously, often offers symptomatic relief.[23] Treatment of an identified leak may include injection of a person's blood into the epidural space (an epidural blood patch), spinal surgery, or fibrin glue.[23]
Lumbar puncture[edit]
Vials containing human cerebrospinal fluid.
Main article: Lumbar puncture
CSF can be tested for the diagnosis of a variety of neurological diseases, usually obtained by a procedure called lumbar puncture.[24] Lumbar puncture is carried out under sterile conditions by inserting a needle into the subarachnoid space, usually between the third and fourth lumbar vertebrae. CSF is extracted through the needle, and tested.[22] About one third of people experience a headache after lumbar puncture,[22] and pain or discomfort at the needle entry site is common. Rarer complications may include bruising, meningitis or ongoing post lumbar-puncture leakage of CSF.[1]
Testing often including observing the colour of the fluid, measuring CSF pressure, and counting and identifying white and red blood cells within the fluid; measuring protein and glucose levels; and culturing the fluid.[22][24] The presence of red blood cells and xanthochromia may indicate subarachnoid hemorrhage; whereas central nervous system infections such as meningitis, may be indicated by elevated white blood cell levels.[24] A CSF culture may yield the microorganism that has caused the infection,[22] or PCR may be used to identify a viral cause.[24] Investigations to the total type and nature of proteins reveal point to specific diseases, including multiple sclerosis, paraneoplastic syndromes, systemic lupus erythematosus, neurosarcoidosis, cerebral angiitis;[1] and specific antibodies such as Aquaporin 4 may be tested for to assist in the diagnosis of autoimmune conditions.[1] A lumbar puncture that drains CSF may also be used as part of treatment for some conditions, including idiopathic intracranial hypertension and normal pressure hydrocephalus.[1]
Lumbar puncture can also be performed to measure the intracranial pressure, which might be increased in certain types of hydrocephalus. However, a lumbar puncture should never be performed if increased intracranial pressure is suspected due to certain situations such as a tumour, because it can lead to fatal brain herniation.[22]
Anaesthesia and chemotherapy[edit]
See also: Blood–cerebrospinal fluid barrier
Some anaesthetics and chemotherapy are injected intrathecally into the subarachnoid space, where they spread around CSF, meaning substances that cannot cross the blood-brain barrier can still be active throughout the central nervous system.[25][26] Baricity refers to the density of a substance compared to the density of human cerebrospinal fluid and is used in general anesthesia to determine the manner in which a particular drug will spread in the intrathecal space.[25]
History[edit]
Various comments by ancient physicians have been read as referring to CSF. Hippocrates discussed "water" surrounding the brain when describing congenital hydrocephalus, and Galen referred to "excremental liquid" in the ventricles of the brain, which he believed was purged into the nose. But for some 16 intervening centuries of ongoing anatomical study, CSF remained unmentioned in the literature. This is perhaps because of the prevailing autopsy technique, which involved cutting off the head, thereby removing evidence of CSF before the brain was examined.[27]
The modern rediscovery of CSF is now credited to Emanuel Swedenborg. In a manuscript written between 1741 and 1744, unpublished in his lifetime, Swedenborg referred to CSF as "spirituous lymph" secreted from the roof of the fourth ventricle down to the medulla oblongata and spinal cord. This manuscript was eventually published in translation in 1887.[27]
Albrecht von Haller, a Swiss physician and physiologist, made note in his 1747 book on physiology that the "water" in the brain was secreted into the ventricles and absorbed in the veins, and when secreted in excess, could lead to hydrocephalus.[27] Francois Magendie studied the properties of CSF by vivisection. He discovered the foramen Magendie, the opening in the roof of the fourth ventricle, but mistakenly believed that CSF was secreted by the pia mater.[27]
Thomas Willis (noted as the discoverer of the circle of Willis) made note of the fact that the consistency of CSF is altered in meningitis.[27] In 1869 Gustav Schwalbe proposed that CSF drainage could occur via lymphatic vessels.[1]
In 1891, W. Essex Wynter began treating tubercular meningitis by tapping the subarachnoid space, and Heinrich Quincke began to popularize lumbar puncture, which he advocated for both diagnostic and therapeutic purposes.[27] In 1912, a neurologist William Mestrezat gave the first accurate description of the chemical composition of CSF.[27] In 1914, Harvey W. Cushing published conclusive evidence that CSF is secreted by the choroid plexus.[27]
Other animals[edit]
During phylogenesis, CSF is present within the neuraxis before it circulates.[3] The CSF of Teleostei fish is contained within the ventricles of the brains, but not in a nonexistent subarachnoid space.[3] In mammals, where a subarachnoid space is present, CSF is present in it.[3] Absorption of CSF is seen in amniotes and more complex species, and as species become progressively more complex, the system of absorption becomes progressively more enhanced, and the role of spinal epidural veins in absorption plays a progressively smaller and smaller role.[3]
The amount of cerebrospinal fluid varies by size and species.[28] In humans and other mammals, cerebrospinal fluid, produced, circulating, and reabsorbed in a similar manner to humans, and with a similar function, turns over at a rate of 3–5 times a day.[28] Problems with CSF circulation leading to hydrocephalus occur in other animals.[28]
See also[edit]
Craniosacral therapy
Neuroglobin
Pandy's test
Reissner's fiber
Syrinx (medicine)
References[edit]
^ Jump up to: a b c d e f g h i j k l m n o p q r Wright, Ben L. C.; Lai, James T. F.; Sinclair, Alexandra J. (26 January 2012). "Cerebrospinal fluid and lumbar puncture: a practical review". Journal of Neurology. 259 (8): 1530–1545. doi:10.1007/s00415-012-6413-x.
^ Jump up to: a b c d e f g h i j k l Guyton, Arthur C.; Hall, John Edward (2005). Textbook of medical physiology (11th ed.). Philadelphia: W.B. Saunders. pp. 764–7. ISBN 978-0-7216-0240-0.
^ Jump up to: a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac Sakka, L.; Coll, G.; Chazal, J. (December 2011). "Anatomy and physiology of cerebrospinal fluid". European Annals of Otorhinolaryngology, Head and Neck Diseases. 128 (6): 309–316. doi:10.1016/j.anorl.2011.03.002.
^ Jump up to: a b Klarica M, Orešković D (2014). "A new look at cerebrospinal fluid movement". Fluids Barriers CNS. 11: 16. doi:10.1186/2045-8118-11-16. PMC 4118619  . PMID 25089184.
^ Jump up to: a b c d e Saladin, Kenneth (2012). Anatomy and Physiology (6th ed.). McGraw Hill. pp. 519–20.
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Jump up ^ Merril CR, Goldman D, Sedman SA, Ebert MH (March 1981). "Ultrasensitive stain for proteins in polyacrylamide gels shows regional variation in cerebrospinal fluid proteins". Science. 211 (4489): 1437–8. doi:10.1126/science.6162199. PMID 6162199.
Jump up ^ Saunders NR, Habgood MD, Dziegielewska KM (1999). "Barrier mechanisms in the brain, I. Adult brain". Clin. Exp. Pharmacol. Physiol. 26 (1): 11–9. doi:10.1046/j.1440-1681.1999.02986.x. PMID 10027064.
Jump up ^ Jurado, Rafael; Walker, H. Kenneth (1990). "Cerebrospinal Fluid". Clinical Methods: The History, Physical, and Laboratory Examinations (3rd ed.). Butterworths. ISBN 040990077X.
^ Jump up to: a b c d Schoenwolf, Gary C.; Larsen, William James (2009). "Development of the Brain and Cranial Nerves". Larsen's human embryology (4th ed.). Philadelphia: Churchill Livingstone/Elsevier. ISBN 978-0-443-06811-9. [page needed]
Jump up ^ Noback, Charles; Norman L. Strominger; Robert J. Demarest; David A. Ruggiero (2005). The Human Nervous System. Humana Press. p. 93. ISBN 978-1-58829-040-3.
Jump up ^ Iliff JJ, Wang M, Liao Y, et al. (August 2012). "A paravascular pathway facilitates CSF flow through the brain parenchyma and the clearance of interstitial solutes, including amyloid β". Science Translational Medicine. 4 (147): 147ra111. doi:10.1126/scitranslmed.3003748. PMC 3551275  . PMID 22896675.
Jump up ^ Allan H. Ropper, Robert H. Brown Adams and Victor's Principles of Neurology McGraw-Hill Professional; 8 edition (March 29, 2005) Ch. 30 p. 530.
Jump up ^ Irani, David N. (14 April 2018). "Cerebrospinal Fluid in Clinical Practice". Elsevier Health Sciences. Retrieved 14 April 2018 – via Google Books.
Jump up ^ Young, Paul A. (2007). Basic clinical neuroscience (2nd ed.). Philadelphia, Pa.: Lippincott Williams & Wilkins. p. 292. ISBN 0-7817-5319-8.
Jump up ^ Hall, John (2011). Guyton and Hall textbook of medical physiology (12th ed.). Philadelphia, Pa.: Saunders/Elsevier. p. 749. ISBN 978-1-4160-4574-8.
Jump up ^ Johnston M (2003). "The importance of lymphatics in cerebrospinal fluid transport". Lymphat. Res. Biol. 1 (1): 41–4. doi:10.1089/15396850360495682. PMID 15624320.
Jump up ^ Dimitri Agamanolis (May 2011). "Chapter 14 – Cerebrospinal Fluid :THE NORMAL CSF". Neuropathology. Northeast Ohio Medical University. Retrieved 2014-12-25.
^ Jump up to: a b c d e f g h Colledge, Nicki R.; Walker, Brian R.; Ralston, Stuart H., eds. (2010). Davidson's principles and practice of medicine (21st ed.). Edinburgh: Churchill Livingstone/Elsevier. pp. 1220–1. ISBN 978-0-7020-3084-0.
^ Jump up to: a b c d e "Hydrocephalus Fact Sheet". www.ninds.nih.gov. National Institute of Neurological Disorders and Stroke. Retrieved 19 May 2017.
^ Jump up to: a b c d Kasper, Dennis; Fauci, Anthony; Hauser, Stephen; Longo, Dan; Jameson, J.; Loscalzo, Joseph (2015). Harrison's Principles of Internal Medicine (19 ed.). McGraw-Hill Professional. p. 2606–7. ISBN 978-0-07-180215-4.
^ Jump up to: a b c d e f g Colledge, Nicki R.; Walker, Brian R.; Ralston, Stuart H., eds. (2010). Davidson's principles and practice of medicine (21st ed.). Edinburgh: Churchill Livingstone/Elsevier. pp. 1147–8. ISBN 978-0-7020-3084-0.
^ Jump up to: a b c Paldino, Michael; Mogilner, Alon Y.; Tenner, Michael S. (December 2003). "Intracranial hypotension syndrome: a comprehensive review". Neurosurgical Focus. 15 (6): 1–8. doi:10.3171/foc.2003.15.6.8.
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External links[edit]
Wikimedia Commons has media related to Cerebrospinal fluid.
Circulation of Cerebrospinal Fluid (CSF) – Interactive Tool
Cerebrospinal fluid – course material in neuropathology
Identification of the Cerebrospinal Fluid System Dynamics
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Todt Hill
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Todt Hill
Todt Hill view
Highest point
Coordinates
40°36′08″N 74°06′44″W / 40.60222°N 74.11222°W / 40.60222; -74.11222Coordinates: 40°36′08″N 74°06′44″W / 40.60222°N 74.11222°W / 40.60222; -74.11222
Geography
Location of Todt Hill on Staten Island
Todt Hill (New York)
Show map of New York City Show map of New York Show all
Todt Hill (/ˈtoʊt/ TOHT)[1] is a 401-foot-tall (122 m) hill formed of serpentine rock on Staten Island, New York. It is the highest natural point in the five boroughs of New York City and the highest elevation on the entire Atlantic coastal plain from Florida to Cape Cod.[2] The summit of the ridge is largely covered in woodlands as part of the Staten Island Greenbelt, although much of the surrounding area is developed and residential.[3] It is considered one of the most exclusive and most expensive areas of Staten Island.[4]
Contents
1 History
2 Geography
3 Demographics
4 Notable residents
5 Transportation
6 References
History[edit]
The name Todt comes from the Dutch language word for "dead" and may refer to the cemetery (the present Moravian Cemetery, opened in 1740 and now the island's largest cemetery[5]) on the southwestern foot of the ridge near the town of New Dorp that has been in use since colonial days. An alternate explanation is that the name was given by early Dutch settlers because of treeless rocky exposures on the hilltop,[6] caused by the soil of the Staten Island Serpentinite locality.
At the beginning of the 20th century, many houses designed by the architect Ernest Flagg were built in the area. A significant part of Todt Hill is now included in the Staten Island Greenbelt.
Geography[edit]
The term Todt Hill is now often used to include the upscale developments in the hills along the eastern side of the ridge, which most island geographers classify as part of the neighborhood of Dongan Hills.
Two small, natural ponds are found on Todt Hill, and a Roman Catholic priory is located near the summit. Staten Island Academy, a private school, moved its campus to Todt Hill in the 1960s. There is a golf course adjoining the Moravian Cemetery, each of which has a man-made pond. Otherwise the hill is either parkland or private homes. There is no public transit available on Todt Hill, and most of the streets, including Todt Hill Road, the neighborhood's main thoroughfare, lack sidewalks.
Demographics[edit]
Todt Hill consists of the two census tracts 177 and 181 (though census tract 177 incorporates part of Emerson Hill). According to the 2010 census,[7] the demographics of Todt Hill were 80% non Hispanic White, 1% Black, 11% Asian, and 1% Multiracial. Hispanics of any race made up 7% of the population. The median household income of the area is roughly $120,000. Todt Hill is one of Staten Island's most affluent areas.
As of 2011, the population of the district is about 11,000 inhabitants. The population density was approximately 1,400 people per square kilometer.[8]
Notable residents[edit]
The late Gambino crime family boss Paul Castellano lived there, in a house noted for its intended resemblance to the White House. His family continued to live on Todt Hill after his death, but moved in 2005.
Mob Wives reality television star, Drita D’avanzo, grew up in the Todt Hill Houses.[9]
Former New York Mets relief pitcher John Franco currently lives on the hill.
The Corleone family compound from The Godfather was filmed on Todt Hill.
Frank Matthews, a notorious drug kingpin in the 1970s, lived on Todt Hill.
Transportation[edit]
Todt Hill is served by multiple bus routes on Richmond Road, including the S74, S84 and S76 local buses, and the SIM15 express bus.[10]
References[edit]
Jump up ^ Flegenheimer, Matt (5 September 2011). "Todt Hill in Staten Island Offers a Different New York". Retrieved 6 April 2018 – via NYTimes.com.
Jump up ^ Sanderson, Eric (2009). Mannahatta A Natural History of New York City. Harry N. Abrams. pp. 83–84.
Jump up ^ "www.library.csi.cuny.edu". cuny.edu. Retrieved 6 April 2018.
Jump up ^ "Top 3 Most Expensive Staten Island Homes Sold in 2011". statenislandlifestyle.com. Retrieved 6 April 2018.
Jump up ^ Douglas Keister (2011). Stories in Stone New York: A Field Guide to New York City Area Cemeteries and Their Residents. Gibbs Smith. pp. 177, 256. ISBN 1423621026.
Jump up ^ Frank, Dave. "Geology of National Parks". 3dparks.wr.usgs.gov. Retrieved 6 April 2018.
Jump up ^ "Mapping America: Every City, Every Block". 13 December 2010. Retrieved 6 April 2018 – via NYTimes.com.
Jump up ^ "Todt Hill neighborhood in Staten Island, New York (NY)". city- data.com. Retrieved 2014-12-29.
Jump up ^ Andrea Boyarsky (April 8, 2011). "New television show 'Mob Wives' follows four Staten Island women and their lifestyles". SILive.com. Staten Island Advance. Retrieved June 8, 2011.
Jump up ^ "Staten Island Bus Map" (PDF). Metropolitan Transportation Authority. August 2018. Retrieved August 18, 2018.
Jackson, Kenneth T., ed. (2010), The Encyclopedia of New York City (2nd ed.), New Haven: Yale University Press, ISBN 978-0-300-11465-2
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