"the kind of sensory inputs which project to a specific region of the primary somatosensory cortex. Groups of nerve terminals located in the different layers of the skin are categorized depending on whether the skin is hairy, nonhairy, or an exposed mucous membrane. The hairy parts of the body such as the forearm or the leg have two groups of nerve endings: those that end along with the hair follicles, and also with the arborizations of unmyelinated axons which are referred to as “free” nerve endings because they are served by both myelinated and unmyelinated axons. Nonhairy skin, such as"
"using it"", 52.25 ""zīxū"" 髭鬚 ""facial hair"", and 52.26 ""yīnmáo"" 陰毛 ""pubic hair"". Li details additional names and their corresponding pulse diagnosis acupuncture channels. Hair from different positions is given different names: Hair on the head, called Fa [髮] (hair), pertains to Kidney Channel of Foot Lesser Yin and Stomach Channel of Foot Greater Yang. Hair in front of the ears, called Bin [鬢] (temples), pertains to Sanjiao Channel of Hand Lesser Yang and Gall Bladder Channel of Foot Lesser Yang. Hair above the eyes, called Mei [眉] (eyebrow), pertains to Large Intestine Channel of Hand Greater Yang and Stomach"
"term is still often used for epidermoid and pilar cysts. The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet. In males a common place for them to develop is the scrotum and chest. They are more common in hairier areas, where in cases of long duration they could result in hair loss on the skin surface immediately above the cyst. They are smooth to the touch, vary in size, and are generally round in shape. They"
"of the dermis into the epidermis. At the surface of the skin in hands and feet, they appear as epidermal or papillary ridges (colloquially known as fingerprints). Blood vessels in the dermal papillae nourish all hair follicles and bring nutrients and oxygen to the lower layers of epidermal cells. The pattern of ridges they produce in hands and feet are partly genetically determined features that develop before birth. They remain substantially unaltered (except in size) throughout life, and therefore determine the patterns of fingerprints, making them useful in certain functions of personal identification. The dermal papillae are part of the"
"the hair shaft. The structure consisting of hair, hair follicle, arrector pili muscles, and sebaceous gland is an epidermal invagination known as a ""pilosebaceous unit"". Sebaceous glands are also found in hairless areas (glabrous skin) of the eyelids, nose, penis, labia minora, the inner mucosal membrane of the cheek, and nipples. Some sebaceous glands have unique names. Sebaceous glands on the lip and mucosa of the cheek, and on the genitalia, are known as Fordyce spots, and glands on the eyelids are known as meibomian glands. Sebaceous glands of the breast are also known as Montgomery's glands. Sebaceous glands are"
"skin-tight clothing. Pubic hair is a collection of coarse hair found in the pubic region. It will often also grow on the thighs and abdomen. Zoologist Desmond Morris disputes theories that it developed to signal sexual maturity or protect the skin from chafing during copulation, and prefers the explanation that pubic hair acts as a scent trap. Also, both sexes having thick pubic hairs act as a sort of cushion during intercourse. The genital area of males and females are first inhabited by shorter, lighter vellus hairs that are next to invisible and only begin to develop into darker, thicker"
"easily achieved by microscopic examination of the hair nodules, and can be confirmed by sequence analysis of the nuclear ribosomal internal transcribed spacer region. ""Piedraia hortae"" causes the formation of nodules on the hair shaft, a clinical superficial disease commonly known as black piedra. Black piedra is usually seen in tropical regions and it usually targets humans of all ages and targets the scalp, moustache and occasionally pubic hair. The source of the infection is usually in soils, poor hygiene, long hair, cultural use of veils and the application of plant oils to wet hair favours the growth of the"
"by licensed professionals in medical offices or speciality spas. Care of the hair and care of the scalp skin may appear separate, but are actually intertwined because hair grows from beneath the skin. The living parts of hair (hair follicle, hair root, root sheath and sebaceous gland) are beneath the skin, while the actual hair shaft which emerges (the cuticle which covers the cortex and medulla) has no living processes. Damage or changes made to the visible hair shaft cannot be repaired by a biological process, though much can be done to manage hair and ensure that the cuticle remains"
"Pubic hair Pubic hair is terminal body hair that is found in the genital area of adolescent and adult humans. The hair is located on and around the sex organs and sometimes at the top of the inside of the thighs. In the pubic region around the pubis bone, it is known as a ""pubic patch"". Pubic hair is found on the scrotum in the male and on the vulva in the female. Although fine vellus hair is present in the area in childhood, pubic hair is considered to be the heavier, longer and coarser hair that develops during puberty"
"genital area begins to produce thicker and rougher, often curlier, hair with a faster growth rate. The onset of pubic hair development is termed pubarche. In males, the first pubic hair appears as a few sparse hairs that are usually thin on the scrotum or at the upper base of the penis (stage 2). Within a year, hairs around the base of the penis are abundant (stage 3). Within 3 to 4 years, hair fills the pubic area (stage 4) and becomes much thicker and darker, and by 5 years extends to the near thighs and upwards on the abdomen"
"Tinea capitis Tinea capitis (also known as ""herpes tonsurans"", ""ringworm of the hair"", ""ringworm of the scalp"", ""scalp ringworm"", and ""tinea tonsurans"") is a cutaneous fungal infection (dermatophytosis) of the scalp. The disease is primarily caused by dermatophytes in the ""Trichophyton"" and ""Microsporum"" genera that invade the hair shaft. The clinical presentation is typically single or multiple patches of hair loss, sometimes with a 'black dot' pattern (often with broken-off hairs), that may be accompanied by inflammation, scaling, pustules, and itching. Uncommon in adults, tinea capitis is predominantly seen in pre-pubertal children, more often boys than girls. At least eight"
"fluids that cool the body by evaporation. The glands at the opening of the hair produce a fatty secretion that lubricates the hair. Hair growth begins inside the hair follicle. The only ""living"" portion of the hair is found in the follicle. The hair that is visible is the hair shaft, which exhibits no biochemical activity and is considered ""dead"". The base of a hair's root (the ""bulb"") contains the cells that produce the hair shaft. Other structures of the hair follicle include the oil producing sebaceous gland which lubricates the hair and the arrector pili muscles, which are responsible"
"Hair removal Hair removal, also known as epilation or depilation, is the deliberate removal of body hair. Hair typically grows all over the human body. Hair can become more visible during and after puberty and men tend to have thicker, more visible body hair than women. Both men and women have visible hair on the head, eyebrows, eyelashes, armpits, pubic region, arms, and legs; men and some women also have thicker hair on their face, abdomen, back and chest. Hair does not generally grow on the lips, the underside of the hands or feet or on certain areas of the"
"Human hair growth The growth of human hair occurs everywhere on the body except for the soles of the feet, the lips, palms of the hands, some external genital areas, the navel, scar tissue, and, apart from eyelashes, the eyelids. Hair is a stratified squamous keratinized epithelium made of multi-layered flat cells whose rope-like filaments provide structure and strength to the hair shaft. Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen. Each phase has specific characteristics that determine the length of the hair. The body has different types of hair, including vellus"
"canal is sometimes trimmed for cosmetic reasons. Excessive hair growth within or on the ear is known medically as ""auricular hypertrichosis"". Some men, particularly in the male population of India, have coarse hair growth along the lower portion of the helix, a condition referred to as ""having ""hairy pinnae"""" (""hypertrichosis lanuginosa acquisita""). Hair is a protein filament that grows from follicles in the dermis, or skin. With the exception of areas of glabrous skin, the human body is covered in follicles which produce thick terminal and fine vellus hair. It is an important biomaterial primarily composed of protein, notably keratin."
"Milium (dermatology) A milium (""plural"" milia), also called a milk spot or an oil seed, is a clog of the eccrine sweat gland. It is a keratin-filled cyst that can appear just under the epidermis or on the roof of the mouth. Milia are commonly associated with newborn babies but can appear on people of all ages. They are usually found around the nose and eyes, and sometimes on the genitalia, often mistaken by those affected as warts or other sexually transmitted diseases. Milia can also be confused with stubborn whiteheads. In children, milia often disappear within two to four"
"Chest hair Chest hair is hair that grows on the chest of a person in the region between the neck and the abdomen. Chest hair develops during and after puberty along with other types of androgenic hair. Although vellus hair is already present in the area in childhood, chest hair is the terminal hair that develops as an effect of rising levels of androgens (primarily testosterone and its derivatives) due to puberty. Different from the head hair it is therefore a secondary sexual characteristic. Men tend to be covered with far more terminal hair, particularly on the chest, the abdomen,"
"Beard A beard is the collection of hair that grows on the chin, upper lip, cheeks and neck of humans and some non-human animals. In humans, usually only pubescent or adult males are able to grow beards. However, women with hirsutism, a hormonal condition of excessive hairiness, may develop a beard. Throughout the course of history, societal attitudes toward male beards have varied widely depending on factors such as prevailing cultural-religious traditions and the current era's fashion trends. Some religions (such as Islam and Sikhism) have considered a full beard to be absolutely essential for all males able to grow"
"can only be seen round the edge of the scab. A mousy odour is often present. Growth continues to take place for several months, when scab and scutulum come away, leaving a shining bare patch destitute of hair. The disease is essentially chronic, lasting from ten to twenty years. It is caused by the growth of a fungus, and pathologically is the reaction of the tissues to the growth. The fungus was named after a microscopic structure termed ""achorion"" (a term not used in modern science), seen in scrapings of infected skin, which consists of slender, mycelial threads matted together,"
"same. These hairs then form a heat-trapping layer above the epidermis. This process is formally called piloerection, derived from the Latin words 'pilus' ('hair') and 'erectio' ('rising up'), but is more commonly known as 'having goose bumps' in English. This is more effective in other mammals whose fur fluffs up to create air pockets between hairs that insulate the body from the cold. The opposite actions occur when the body is too warm; the arrector muscles make the hair lie flat on the skin which allows heat to leave. In some mammals, such as hedgehogs and porcupines, the hairs have"
"skin of the abdomen begins to produce coarser, longer and more pigmented hair (terminal hair). This process primarily affects men. Initially hair grows in a vertical line from the pubic area up to the navel and from the thorax down to the navel. Slang terms for this line of hair include ""goodie trail"", ""snail trail"", ""tiger line"", or ""treasure trail"". Although the development of abdominal hair normally begins during puberty, it may also start later, between the ages of 20 and 30. With some men, the abdominal hair will stay within a clearly defined vertical line, but in others, terminal"
"Pilus A pilus (Latin for 'hair'; plural : ""pili"") is a hair-like appendage found on the surface of many bacteria. The terms ""pilus"" and ""fimbria"" (Latin for 'fringe'; plural: ""fimbriae"") can be used interchangeably, although some researchers reserve the term ""pilus"" for the appendage required for bacterial conjugation. All pili in the latter sense are primarily composed of pilin proteins, which are oligomeric. Dozens of these structures can exist on the bacteria. Some bacteria, viruses or bacteriophages attach to receptors on pili at the start of their reproductive cycle. Pili are antigenic. They are also fragile and constantly replaced, sometimes"
"Abdominal hair Abdominal hair is the hair that grows on the abdomen of humans and non-human mammals, in the region between the pubic area and the thorax (chest). The growth of abdominal hair follows the same pattern on nearly all mammals, vertically from the pubic area upwards and from the thorax downwards to the navel. The abdominal hair of non-human mammals is part of the pelage, (hair or fur). Before puberty, the abdominal region of both males and females is covered with very fine vellus hair. In response to rising levels of androgens (mainly testosterone) during and after puberty, the"
"(such as from pubertal hormonal imbalances or drug side effects), and/or gender status. In the hair follicle, stemcells reside in a discrete microenvironment called the bulge, located at the base of the part of the follicle that is established during morphogenesis but does not degenerate during the hair cycle. The bulge contains multipotent stemcells that can be recruited during wound healing to help the repair of the epidermis. Hair removal Hair removal, also known as epilation or depilation, is the deliberate removal of body hair. Hair typically grows all over the human body. Hair can become more visible during and"
"for causing hairs to stand up. In humans with little body hair, the effect results in goose bumps. The ""root of the hair"" ends in an enlargement, the ""hair bulb"", which is whiter in color and softer in texture than the shaft, and is lodged in a follicular involution of the epidermis called the hair follicle. Bulb of hair layers consist of fibrous connective tissue, glassy membrane, external root sheath, internal root sheath composed of epithelium stratum (Henle's layer) and granular stratum (Huxley's layer), cuticle, cortex and medulla of hair. All natural hair colors are the result of two types"
"Root hair A root hair, or absorbent hair, the rhizoid of a vascular plant, is a tubular outgrowth of a trichoblast, a hair-forming cell on the epidermis of a plant root. As they are lateral extensions of a single cell and only rarely branched, they are visible to the naked eye and light microscope. They are found only in the region of maturation of the root. Just prior to, and during, root hair cell development, there is elevated phosphorylase activity. The root hairs are where most water absorption happens. They are long and so they can penetrate between soil particles,"
"due to the aging process, which is in stark constrast to humans, whose facial and body hair become stronger. Because infant great apes have thicker ""facial"" (as well as body) hair than their older counterparts, it is not actually androgenic but part of the fur complex. The sensitivity to androgens seems to have been acquired by humans on the gene KRT37 relatively recent. Facial hair Facial hair is hair grown on the face, usually on the chin, cheeks, and upper lip region. It is typically a secondary sex characteristic of human males. Men typically start developing facial hair in the"
"Auricular hypertrichosis Auricular hypertrichosis (""hypertrichosis lanuginosa acquisita"", ""hypertrichosis pinnae auris"") is a genetic condition expressed as long and strong hairs growing from the helix of the pinna. Ear hair generally refers to the terminal hair arising from follicles inside the external auditory meatus in humans. In its broader sense, ""ear hair"" may also include the fine vellus hair covering much of the ear, particularly at the prominent parts of the anterior ear, or even the abnormal hair growth as seen in hypertrichosis and hirsutism. Medical research on the function of ear hair is currently very scarce. Increased hair growth in"
"Hair Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth, hair types, and hair care, but hair is also an important biomaterial primarily composed of protein, notably alpha-keratin. Attitudes towards different hair, such as hairstyles and hair removal, vary widely across different cultures and historical periods, but it is often used to indicate a person's personal"
"All ranges and patterns of hair growth are normal. The areas where terminal hair may grow are the periareolar areas (nipples), the centre and sides of the chest and the clavicle collarbone. The direction of growth of hair can make for interesting patterns, akin to depictions of mathematical vector fields. Typical males will exhibit a node on the upper sternum, the hair above which points up and the hair below which points down Some individuals have spirals on their upper pectoral regions (several inches from the nipple towards the neck) which run clockwise on the left breast and counter-clockwise on"
"Sideburns Sideburns, sideboards, or side whiskers are facial hair grown on the sides of the face, extending from the hairline to run parallel to or beyond the ears. The term ""sideburns"" is a 19th-century corruption of the original ""burnsides"", named after American Civil War general Ambrose Burnside, a man known for his unusual facial hairstyle that connected thick sideburns by way of a moustache, but left the chin clean-shaven. Sideburns can be worn and grown in combination with other styles of facial hair, such as the moustache or goatee, but once they extend from ear to ear via the chin"
"adults. They are described as <1–2 cm pink/red shiny, exophytic lesions that can be pigmented and are clinically very similar to pyogenic granulomas. Histologically, the cells as PAS-positive and clearly surrounded by normal keratinocytes. These tumors are surgically excised usually without complication or recurrence, although malignant porocarcinomas can recur and metastasize to local lymph nodes. Poroma A poroma is a benign skin tumor derived from sweat glands. Although the original term ""poroma ""was initially used to describe a tumor derived from the ductal epithelium of eccrine sweat glands, the term is used in general reference to tumors derived from ductal"
"Moustache A moustache (; , ) is facial hair grown on the upper lip. Moustaches can be groomed by trimming and styling with a type of pomade called moustache wax. The word ""moustache"" is French, and is derived from the Italian ""moustacio"" (fourteenth century), dialectal ""mostaccio"" (16th century), from Medieval Latin ""moustaccium"" (eighth century), Medieval Greek μουστάκιον (""moustakion""), attested in the ninth century, which ultimately originates as a diminutive of Hellenistic Greek μύσταξ (""mustax"", ""mustak-""), meaning ""upper lip"" or ""facial hair"", probably derived from Hellenistic Greek μύλλον (""mullon""), ""lip"". Shaving with stone razors was technologically possible from Neolithic times. A"