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ln the saccule and utricle, hair cells cluster within
maculae, where their cilia contact the otolith (densely packed mineral crystals,
called statoconia, in a matrix)
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What do the utricle do?
Also called the utriculus, a dilated portion of the membranous labyrinth within thee inner ear. It occupies the central part of the bony labyrinth, with the cochlea in front and the semicircular canals, which arise from the utricle, behind.Within the utricle a small projection, known as the macula, is raised from the epithelium inside the membranous labyrinth. It consists of a group of supporting cells, among which are arranged a number of hair cells. Each hair cell has a fine hair process, which extends from the end of the cell into the cavity of the utricle. These hairs are embedded in a jelly-like material, which contains a large number of calcareous bodies known as otoliths.The hair cells of the macula are attached to the nervous system by fibers of the vestibular division of the auditory nerve, each cell being served by one fiber.Next to the utricle is a very similar organ called the saccule. It is also is provided with a macula, like the utricle.Function of the utricleThe otoliths in the utricle are subject to the action of gravity, and since they are in contact with the hairs of the hair cells the gravitational pull upon them is transmitted to the macula. Furthermore, since gravity always pulls the otoliths towards the center of the earth, a change in the position of the head, and therefore of the utricle, alters the direction in which the otoliths pull in relation to the macula. As a result the stimulus to the hair cells changes, and a different sequence of nerve impulses passes along the vestibular division to the brain.In this way the utricle continually reports the position of the head. This information, when associated with information from the muscles, is enough to indicate the position of the body as a whole. Thus even a blindfold person knows the exact position in space of each part of her body.
What type of cells form hair?
Err... Hair cells on inside, hair follicles on the outside.
What part of the brain maintaines balance while you walk?
In the ear, you have got three semicircular canals. To explain about their position you have to first understand the three dimensions in space. If you are sitting in a room. Go to the corner of the room. Here all three walls are connected to each other at right angles. Semicircular canals lie in these three planes. They are connected to each other at Utricle and Saccule. All of them contain some fluid. When the position of the head changes, there is movement of this fluid. This movement is perceived by the hair cells present in Utricle and Saccule.For verticle position you have receptors in Utricle and for horizontal position you have got receptors in Saccule. They send signals to the Vestibular nucleus present in the brain,via the Vestibulocochlear nerve,at the rate of 100/sec to several hundred/seconds.(The eighth cranial nerve.) Then you have got two such apparatuses in your two ears, giving you stereoscopic effect adding to the efficacy of the the orientation of position of your head. All these apparatus lie in the Petrous part of the temporal bone. You have other signals, like position sense sensations from all joints of your body. They add to the efficacy of the system. Then your eyes also provide signals of your position.(Sometimes they momentarily cheat you, when you think your train is moving forward when actually train to the side of you is moving backwards.) So mainly the position and level of the fluid in the semicircular canals added to other sense receptors give you your sense of balance. They all gather at the Vestibular nucleus present in brain.(The size of these semicircular canals is very small. They are only about 2 mm across.)
What parts of the ear are in the inner ear?
The inner ear consists of the bony labyrinth, a hollow cavity in the temporal bone of the skull with a system of passages comprising two main functional parts: -- the cochlea, dedicated to hearing -- the vestibular system, dedicated to balance The cochlea transforms vibrations into nerve impulses for the brain. On the opposite side of the vestibule are the three semi-circular canals, which provide nerve signals on the motion of the body along 3 axes. There are otolithic structures in the vestibule (called the utricle and saccule) that provide information on the relative position of the head and body.
What do you call root hair cells working together?
root hair tissue
What do the utricle do?
Also called the utriculus, a dilated portion of the membranous labyrinth within thee inner ear. It occupies the central part of the bony labyrinth, with the cochlea in front and the semicircular canals, which arise from the utricle, behind.Within the utricle a small projection, known as the macula, is raised from the epithelium inside the membranous labyrinth. It consists of a group of supporting cells, among which are arranged a number of hair cells. Each hair cell has a fine hair process, which extends from the end of the cell into the cavity of the utricle. These hairs are embedded in a jelly-like material, which contains a large number of calcareous bodies known as otoliths.The hair cells of the macula are attached to the nervous system by fibers of the vestibular division of the auditory nerve, each cell being served by one fiber.Next to the utricle is a very similar organ called the saccule. It is also is provided with a macula, like the utricle.Function of the utricleThe otoliths in the utricle are subject to the action of gravity, and since they are in contact with the hairs of the hair cells the gravitational pull upon them is transmitted to the macula. Furthermore, since gravity always pulls the otoliths towards the center of the earth, a change in the position of the head, and therefore of the utricle, alters the direction in which the otoliths pull in relation to the macula. As a result the stimulus to the hair cells changes, and a different sequence of nerve impulses passes along the vestibular division to the brain.In this way the utricle continually reports the position of the head. This information, when associated with information from the muscles, is enough to indicate the position of the body as a whole. Thus even a blindfold person knows the exact position in space of each part of her body.
What is the section of the ear which help us to balance?
The vestibular system in the inner ear. It's responsible for the sensations of balance and motion. It uses the same kinds of fluids and detection hair cells as the cochlea uses, and sends information to the brain about the attitude, rotation, and linear motion of the head. The type of motion or attitude detected by a hair cell depends on its associated mechanical structures, such as the curved tube of a semicircular canal or the calcium carbonate crystals (otolith) of the saccule and utricle
What is motion sickness?
Motion sickness is sickness induced by motion (as in travel by air, car, or ship) and characterized by nausea.The vestibular apparatus located at our temporal bone or inner ear region is important for balance. It contains 3 semi-circular canals and 5 sense organs:UtricleSaccule3 ampullaeThe semi-circular canals are important for detecting changes in position. As head and canals move, fluid in canals remains stationary due to inertia. The fluid enters ampullae and causes cilia on hair cells to bend, causing either depolarization or hyperpolarization. Then the vestibular nerves synapse with hair cells and relay position to brain stem and cerebellum.The utricle and saccule are important for maintaining balance when stationary. They contain hair cells covered with cilia and dense statoconia crystals. Located in ampulla of semicircular canals. As head moves and weight of statoconia causes cilia to bend, hair cells become depolarized or hyperpolarized. Then the vestibular nerves synapse with hair cells and relay position to brain stem and cerebellum.
What type of cells form hair?
Err... Hair cells on inside, hair follicles on the outside.
What is the difference in root hair cells and leaf cells?
root hair cells dont have chloroplasts
Do pieces of hair have cells?
Yes, but they are actually dead cells. Your hair and nails are basically a secretion of dead cells.
What part of the brain maintaines balance while you walk?
In the ear, you have got three semicircular canals. To explain about their position you have to first understand the three dimensions in space. If you are sitting in a room. Go to the corner of the room. Here all three walls are connected to each other at right angles. Semicircular canals lie in these three planes. They are connected to each other at Utricle and Saccule. All of them contain some fluid. When the position of the head changes, there is movement of this fluid. This movement is perceived by the hair cells present in Utricle and Saccule.For verticle position you have receptors in Utricle and for horizontal position you have got receptors in Saccule. They send signals to the Vestibular nucleus present in the brain,via the Vestibulocochlear nerve,at the rate of 100/sec to several hundred/seconds.(The eighth cranial nerve.) Then you have got two such apparatuses in your two ears, giving you stereoscopic effect adding to the efficacy of the the orientation of position of your head. All these apparatus lie in the Petrous part of the temporal bone. You have other signals, like position sense sensations from all joints of your body. They add to the efficacy of the system. Then your eyes also provide signals of your position.(Sometimes they momentarily cheat you, when you think your train is moving forward when actually train to the side of you is moving backwards.) So mainly the position and level of the fluid in the semicircular canals added to other sense receptors give you your sense of balance. They all gather at the Vestibular nucleus present in brain.(The size of these semicircular canals is very small. They are only about 2 mm across.)
What parts of the ear are in the inner ear?
The inner ear consists of the bony labyrinth, a hollow cavity in the temporal bone of the skull with a system of passages comprising two main functional parts: -- the cochlea, dedicated to hearing -- the vestibular system, dedicated to balance The cochlea transforms vibrations into nerve impulses for the brain. On the opposite side of the vestibule are the three semi-circular canals, which provide nerve signals on the motion of the body along 3 axes. There are otolithic structures in the vestibule (called the utricle and saccule) that provide information on the relative position of the head and body.
What are root hair cells?
Roots from your hair.
How many cells are there in a root hair?
there are about thousands of root hairs
What do you call root hair cells working together?
root hair tissue
Receptors that contains hair bundles hair cells and supporting cells?
spiral organ of Corti
