ampullaris การใช้

• Covering the crista ampullaris is a gelatinous mass called the cupula.
• Inside are hair cells and supporting cells known as the crista ampullaris.
• The semicircular ducts are filled with endolymph, and contain the crista ampullaris.
• The crista ampullaris itself is a cone-shaped structure, covered in receptor cells called " hair cells ".
• Part of the crista ampullaris, the cupula has embedded within it hair cells that have several stereocilia associated with each kinocilium.
• The cupula itself is the gelatinous component of the crista ampullaris that extends from the crista to the roof of the ampullae.
• As the endolymph pushes the cupula, the stereocilia is bent as well, stimulating the hair cells within the crista ampullaris.
• Upon angular acceleration ( rotation ), the endolymph within the semicircular duct deflects the cupula against the hair cells of the crista ampullaris.
• Stimulation of the semicircular canals occurs when movement of the endolymph inside the canals causes movement of the crista ampullaris and the hair cells within them.
• Stereocilia bend causing chemical reactions in the crita ampullaris they surround ( critae are at cilia tips ); this reaction creates an action potential carried by the vestibular nerve.
• This includes ~ 7, 000 hair cells from each of the semicircular canals located within the crista ampullaris, ~ 30, 000 hair cells from the utricle, and ~ 16, 000 hair cells from the saccule.
• Morphological and immunohistochemical studies in several species have indicated that these dark cell areas also form a single layer resting on top of pigmented cells at the base of the cristae ampullaris in the semi-circular canals and around the utricular macula.