The olfactory nerve carries the sensory information for which of the senses?
"Olfactory toxicity in fish The olfactory system is the system related to the sense of smell (olfaction). Many fish activities are dependent on olfaction, such as: mating, discriminating kin, avoiding predators, locating food, contaminant avoidance, imprinting and homing. These activities are referred to as “olfactory-mediated.” Impairment of the olfactory system threatens survival and has been used as an ecologically relevant sub-lethal toxicological endpoint for fish within studies. Olfactory information is received by sensory neurons, like the olfactory nerve, that are in a covered cavity separated from the aquatic environment by mucus. Since they are in almost direct contact with the"
"underestimated factors."" Olfactory bulb The olfactory bulb (Latin: ""bulbus olfactorius"") is a neural structure of the vertebrate forebrain involved in olfaction, the sense of smell. It sends olfactory information to be further processed in the amygdala, the orbitofrontal cortex (OFC) and the hippocampus where it plays a role in emotion, memory and learning. The bulb is divided into two distinct structures: the main olfactory bulb and the accessory olfactory bulb. The main olfactory bulb connects to the amygdala via the piriform cortex of the primary olfactory cortex and directly projects from the main olfactory bulb to specific amygdala areas. The"
"Olfactory bulb The olfactory bulb (Latin: ""bulbus olfactorius"") is a neural structure of the vertebrate forebrain involved in olfaction, the sense of smell. It sends olfactory information to be further processed in the amygdala, the orbitofrontal cortex (OFC) and the hippocampus where it plays a role in emotion, memory and learning. The bulb is divided into two distinct structures: the main olfactory bulb and the accessory olfactory bulb. The main olfactory bulb connects to the amygdala via the piriform cortex of the primary olfactory cortex and directly projects from the main olfactory bulb to specific amygdala areas. The accessory olfactory"
"peduncular cortex. The AON plays a pivotal but relatively poorly understood role in the processing of odor information. Odors enter the nose (or olfactory rosette in fishes) and interact with the cilia of olfactory receptor neurons. The information is sent via the olfactory nerve (Cranial Nerve I) to the olfactory bulb. After the processing in the bulb the signal is transmitted caudally via the axons of mitral and tufted cells in the lateral olfactory tract. The tract forms on the ventrolateral surface of the brain and passes through the AON, continuing on to run the length of the piriform cortex,"
"cortex in the brain. Olfactory information is further processed and forwarded to the central nervous system (CNS), which controls emotions and behavior as well as basic thought processes. Odor sensation usually depends on the concentration (number of molecules) available to the olfactory receptors. A single odorant is usually recognized by many receptors. Different odorants are recognized by combinations of receptors. The patterns of neuron signals help to identify the smell. The olfactory system does not interpret a single compound, but instead the whole odorous mix. This does not correspond to the concentration or intensity of any single constituent. Most odors"
"association cortical areas, these brain regions synthesize sensory information into our perceptions of the world. The olfactory bulb, responsible for the sense of smell, takes up a large area of the cerebrum in most vertebrates. However, in humans, this part of the brain is much smaller and lies underneath the frontal lobe. The olfactory sensory system is unique since the neurons in the olfactory bulb send their axons directly to the olfactory cortex, rather than to the thalamus first. Damage to the olfactory bulb results in a loss of olfaction (the sense of smell). Speech and language are mainly attributed"
"the amygdala via the piriform cortex of the primary olfactory cortex and directly projects from the main olfactory bulb to specific amygdala areas. The amygdala passes olfactory information on to the hippocampus. The orbitofrontal cortex, amygdala, hippocampus, thalamus, and olfactory bulb have many interconnections directly and indirectly through the cortices of the primary olfactory cortex. These connections are indicative of the association between the olfactory bulb and higher areas of processing, specifically those related to emotion and memory. Associative learning between odors and behavioral responses takes place in the amygdala. The odors serve as the reinforcers or the punishers during"
"olfactory receptors, each sensitive to a narrow range of odorants. These neurons send signals to the glomeruli within the olfactory bulb. Each glomerulus collects information from a specific olfactory receptor neuron. The olfactory signal is then conducted to piriform cortex and the amygdala, and then to the orbitalfrontal cortex, where higher level processing of the odor occurs. Olfactory memory is the recollection of a given smell. Research has found that odor memory is highly persistent and has a high resistance to interference, meaning these memories remain within an individual for long times despite possible interference of other olfactory memories. These"
"olfactory bulb. Olfactory sensory neurons project axons to the brain within the olfactory nerve, (cranial nerveI). These nerve fibers, lacking myelin sheaths, pass to the olfactory bulb of the brain through perforations in the cribriform plate, which in turn projects olfactory information to the olfactory cortex and other areas. The axons from the olfactory receptors converge in the outer layer of the olfactory bulb within small (≈50 micrometers in diameter) structures called glomeruli. Mitral cells, located in the inner layer of the olfactory bulb, form synapses with the axons of the sensory neurons within glomeruli and send the information about"
"membranes that produce and store mucus and olfactory glands that secrete metabolic enzymes found in the mucus. Olfactory neurons are receptor cells in the epithelium that detect odor molecules dissolved in the mucus and transmit information about the odor to the brain in a process called sensory transduction. Olfactory neurons have cilia (tiny hairs) containing proteins that bind to odor molecules, causing an electrical response that spreads through the receptor cells to the olfactory nerve fibers at the back of the nasal cavity. Olfactory nerves and fibers transmit information about odors from the peripheral olfactory system to the central olfactory"
"sensory innervation mainly to the structures within the head and neck. The sensory innervation includes both ""general"" sensation such as temperature and touch, and ""special"" innervation such as taste, vision, smell, balance and hearing The vagus nerve (X) provides sensory and autonomic (parasympathetic) motor innervation to structures in the neck and also to most of the organs in the chest and abdomen. The terminal nerve (0) is involved in hormonal responses to smell, and has been implicated in sexual response and mate selection. The olfactory nerve (I) conveys the sense of smell. Damage to the olfactory nerve (I) can cause"
"Olfaction Olfaction is a chemoreception that forms the sense of smell. Olfaction has many purposes, such as the detection of hazards, pheromones, and food. It integrates with other senses to form the sense of flavor. Olfaction occurs when odorants bind to specific sites on olfactory receptors located in the nasal cavity. Glomeruli aggregate signals from these receptors and transmit them to the olfactory bulb, where the sensory input will start to interact with parts of the brain responsible for smell identification, memory, and emotion. Often, land organisms will have separate olfaction systems for smell and taste (orthonasal smell and retronasal"
"the somatosensory association cortex, which integrates sensory information from the primary somatosensory cortex (temperature, pressure, etc.) to construct an understanding of the object being felt. Inferior to the frontal lobes are found the olfactory bulbs, which receive sensory input from the olfactory nerves and route those signals throughout the brain. Not all olfactory information is routed to the olfactory cortex. Some neural fibers are routed directly to limbic structures, while others are routed to the supraorbital region of the frontal lobe. Such a direct limbic connection makes the olfactory sense unique. The brain cortical regions are related to the auditory,"
"for recognition are referred to now as odor objects. Experience therefore strengthens signal-to-noise ratio in that a previously sensed odor object can be more easily distinguished against greater background noise. The orbitofrontal cortex (OFC) is the final destination of the odor information and is where conscious smell perception arises. Smell information enters directly after passing through the olfactory cortex, which marks the distinction from other sensory information that first pass through the thalamus. The OFC is located dorsal to the prefrontal cortex, allowing smell information direct input to the prefrontal cortex, or the major decision-making area of the brain. There"
"of 6 layers: olfactory nerve layer, glomerular layer, external plexiform layer, mitral cell layer, internal plexiform layer, and granule layer. The terminals of the receptor axons synapse with the dendrites of mitral and tufts cells within the glomeruli of the olfactory bulb. The axons of the mitral and tufts cells send signals to the olfactory cortex. Signals from odor sensation are sent from the olfactory bulb through mitral and tufts cell axons via the lateral olfactory tract and synapse at the primary olfactory cortex. The primary olfactory cortex includes the anterior olfactory nucleus, the piriform cortex, the anterior cortical nucleus"
"and amygdala affect odor perception. During certain physiological states such as hunger a food odor may seem more pleasant and rewarding due to the associations in the amygdala and hippocampus of the food odor stimulus with the reward of eating. Olfactory information is sent to the primary olfactory cortex, where projections are sent to the orbitofrontal cortex. The OFC contributes to this odor-reward association as well as it assesses the value of a reward, i.e. the nutritional value of a food. The OFC receives projections from the piriform cortex, amygdala, and parahippocampal cortices. Neurons in the OFC that encode food"
"Research with a variety of animals suggest the role of norepinephrine in olfactory learning, in which norepinephrine neurons in the locus coeruleus send projections to neurons in the main and accessory olfactory bulbs. This is significant in the formation of olfactory memory and learning. The main olfactory bulb is one of the neural structures that experiences profound change when exposed to offspring odors at the time of childbirth. Human neuroimaging studies suggest that activation of the medial prefrontal cortex (mPFC) occurs during tests of olfactory memory. The medial prefrontal cortex receives extensive olfactory projections, which are activated immediately after birth"
"are only three types of neurons that smell molecules pass before arriving at the OFC: the olfactory receptor cells in the olfactory epithelium, mitral cells, and olfactory pyramidal neurons. At the level of the OFC, associations with other brain areas are made, including input from the mouth (somatosensation), emotional input (amygdala), visual information, and evaluative information (prefrontal cortex). The OFC is responsible for selective odor tuning, fusing of sensory domains, and hedonic evaluations of smells. The experience of eating favored foods with a cold often disappoints. This is because congestion blocks nasal passageways through which air and flavor molecules enter"
"olfactory mucosa, the nerve (actually many small nerve fascicles) travels up through the cribriform plate of the ethmoid bone to reach the surface of the brain. Here the fascicles enter the olfactory bulb and synapse there; from the bulbs (one on each side) the olfactory information is transmitted into the brain via the olfactory tract. The fascicles of the olfactory nerve are not visible on a cadaver brain because they are severed upon removal. The specialized olfactory receptor neurons of the olfactory nerve are located in the olfactory mucosa of the upper parts of the nasal cavity. The olfactory nerves"
"an inability to smell (anosmia), a distortion in the sense of smell (parosmia), or a distortion or lack of taste. If there is suspicion of a change in the sense of smell, each nostril is tested with substances of known odors such as coffee or soap. Intensely smelling substances, for example ammonia, may lead to the activation of pain receptors (nociceptors) of the trigeminal nerve that are located in the nasal cavity and this can confound olfactory testing. The optic nerve (II) transmits visual information. Damage to the optic nerve (II) affects specific aspects of vision that depend on the"
"or via the BNST). The hippocampus forms new and reinforces existing memories. Similarly, the parahippocampus encodes, recognizes and contextualizes scenes. The parahippocampal gyrus houses the topographical map for olfaction. The orbitofrontal cortex (OFC) is heavily correlated with the cingulate gyrus and septal area to act out positive/negative reinforcement. The OFC is the expectation of reward/punishment in response to stimuli. The OFC represents the emotion and reward in decision making. The anterior olfactory nucleus distributes reciprocal signals between the olfactory bulb and piriform cortex. The anterior olfactory nucleus is the memory hub for smell. Loss of smell is known as anosmia."
"the olfactory bulb. There are two types of excitatory inputs received by GABAergic granule cells; those activated by an AMPA receptor and those activated by a NMDA receptor. This allows the granule cells to regulate the processing of the sensory input in the olfactory bulb. The olfactory bulb transmits smell information from the nose to the brain, and is thus necessary for a proper sense of smell. Granule cells in the olfactory bulb have also been found to be important in forming memories linked with scents. Calcium dynamics are essential for several functions of granule cells such as changing membrane"
"primary olfactory cortex. In contrast to vision and hearing, the olfactory bulbs are not cross-hemispheric; the right bulb connects to the right hemisphere and the left bulb connects to the left hemisphere. The gustatory cortex is the primary receptive area for taste. The word ""taste"" is used in a technical sense to refer specifically to sensations coming from taste buds on the tongue. The five qualities of taste detected by the tongue include sourness, bitterness, sweetness, saltiness, and the protein taste quality, called umami. In contrast, the term ""flavor"" refers to the experience generated through integration of taste with smell"
"explains why we can detect more odors than there are receptors in the nasal epithelium. Flavor is perceived by the combination of the sense of taste, sense of smell, and the trigeminal nerve (CN V). The gustatory system is responsible for differentiation between sweet, sour, salty, bitter, and umami. The olfactory system recognizes the odorants as they pass to the olfactory epithelium via a retronasal pathway. This explains why we can identify a variety of flavors in spite of only having five types of taste receptors. The trigeminal nerve senses texture, pain, and temperature of food. For example, the cooling"
"reward information activate the reward system when stimulated, associating the act of eating with reward. The OFC further projects to the anterior cingulate cortex where it plays a role in appetite. The OFC also associates odors with other stimuli, such as taste. Odor perception and discrimination also involve the OFC. The spatial odor map in the glomeruli layer of the olfactory bulb may contribute to these functions. The odor map begins processing of olfactory information by spatially organizing the glomeruli. This organizing aids the olfactory cortices in its functions of perceiving and discriminating odors. The olfactory bulb is, along with"
"Olfactory receptor neuron An olfactory receptor neuron (ORN), also called an olfactory sensory neuron (OSN), is a transduction cell within the olfactory system. Humans have about 10 million olfactory receptor neurons. In vertebrates, ORNs are bipolar neurons with dendrites facing the external surface of the cribriform plate with axons that pass through the cribriform foramina with terminal end at olfactory bulbs. The ORNs are located in the olfactory epithelium in the nasal cavity. The cell bodies of the ORNs are distributed among all three of the stratified layers of the olfactory epithelium. Many tiny hair-like cilia protrude from the olfactory"
"of the amygdala, the periamygdaloid complex, and the rostral entorhinal cortex. A unique characteristic of olfaction is its independence from the thalamus. The odor signals are sent directly from the sensory receptor neuron to the primary cortex. However, communication between the primary and secondary olfactory cortex requires connections with the thalamus. Odor identity, quality, and familiarity are mainly deciphered by the piriform cortex. Consciousness of smell is achieved by projections from the piriform cortex to the medial dorsal nucleus of the thalamus and to the orbitofrontal cortex, which the secondary olfactory cortex is part of. There are approximately 1000 olfactory"
"nervous system and aids in the development of the odorant map. The differentiated olfactory sensory neurons extend pioneering axons, which follow guidance cues released by the underlying mesenchyme, as well as other chemotrophic cues released from the telencephalon. As development of the olfactory pathway progresses, more axons innervate the olfactory bulb, which develops from the rostral-most region of telencephalon. The organization and subsequent processing of odorant information is possible due to the convergence of olfactory sensory neuron axons expressing the same odorant receptors onto the same glomerulus at the olfactory bulb. The olfactory epithelium can be damaged by inhalation of"
"of liquids within the inner ear is generated by motion (for balance) and transmitted vibrations generated by the ossicles (for sound). This creates a nerve signal that passes through the vestibulocochlear nerve. From here, it passes through to the cochlear nuclei, the superior olivary nucleus, the medial geniculate nucleus, and finally the auditory radiation to the auditory cortex. The sense of smell is generated by receptor cells in the epithelium of the olfactory mucosa in the nasal cavity. This information passes through a relatively permeable part of the skull to the olfactory nerve. This nerve transmits to the neural circuitry"
"has cilia in direct contact with the air. Odorous molecules bind to receptor proteins extending from cilia and act as a chemical stimulus, initiating electric signals that travel along the olfactory nerve's axons to the brain. When an electrical signal reaches a threshold, the neuron fires, which sends a signal traveling along the axon to the olfactory bulb, a part of the limbic system of the brain. Interpretation of the smell begins there, relating the smell to past experiences and in relation to the substance(s) inhaled. The olfactory bulb acts as a relay station connecting the nose to the olfactory"
"upper teeth and gums, the nasal mucosa, the palate and roof of the pharynx, the maxillary, ethmoid and sphenoid sinuses and parts of the meninges. The mandibular nerve (V) carries sensory information from the lower lip, the lower teeth and gums, the chin and jaw (except the angle of the jaw, which is supplied by C2-C3), parts of the external ear and parts of the meninges. The mandibular nerve carries touch-position and pain-temperature sensations from the mouth. Although it does not carry taste sensation (the chorda tympani is responsible for taste), one of its branches—the lingual nerve—carries sensation from the"
"by dopaminergic projections from the nucleus accumbens and the substantia nigra, suggesting the role that the olfactory tubercle plays in the reward system. The olfactory tubercle is a multi-sensory processing center due to the number of innervations going to and from other brain regions such as the amygdala, thalamus, hypothalamus, hippocampus, brain stem, auditory and visual sensory fibers, and a number of structures in the reward–arousal system, as well as the olfactory cortex. Due to its many innervations from other brain regions, the olfactory tubercle is involved in merging information across the senses, such as olfactory—audition and olfactory—visual integrations, possibly"
"pathway: the olfactory epithelium and the olfactory bulb. The olfactory epithelium contains olfactory sensory neurons, whose axons innervate the olfactory bulb. In order for olfactory sensory neurons to function properly, they must express odorant receptors and the proper transduction proteins on non-motile cilia that extend from the dendritic knob in addition to projecting their axons to the olfactory bulb. The cells of the olfactory epithelium, including olfactory sensory neurons, begin to differentiate soon after the induction of the olfactory placode. Once the olfactory sensory neurons differentiate, they express odorant receptors, which transduce odorant information from the environment to the central"