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Related Topics:Vestibular systemVestibulocochlear nerveHair cellBony labyrinthType II cell...(Show more)

inner ear, additionally called labyrinth that the ear, part of the ear that has organs of the senses of hearing and also equilibrium. The bony labyrinth, a cavity in the temporal bone, is divided into 3 sections: the vestibule, the semicircular canals, and also the cochlea. In ~ the bony labyrinth is a membranous labyrinth, i beg your pardon is additionally divided right into three parts: the semicircular ducts; two saclike structures, the saccule and utricle, situated in the vestibule; and also the cochlear duct, i m sorry is the only component of the inner ear connected in hearing. The cochlear duct creates a shelf across the cochlea dividing it into two sections, the scala vestibuli and the scala tympani. The whole inner ear is bathed in a cushioning fluid, referred to as the endolymph once it lies within the membranous labyrinth and also the perilymph once it the end the bony and also membranous labyrinths.


In the cochlea, both the bony labyrinth and also the cochlear duct room coiled in a form resembling the of a snail shell. Relaxing along the basilar membrane, which develops the base of the cochlear duct, is an plan of sensory cells and also supporting cells recognized as the organ of Corti. This swarm of cells varies in thickness, so that different regions in ~ the cochlea are sensitive to various wavelengths the sound. As soon as sound waves are conducted across the skeleton of the middle ear, they cause the oval window (a membranous opening between the middle and inner ears) to relocate in and also out together with the stapes the the center ear, come which that is attached. The movement of the oval window sets increase a tide in the perilymph pour it until it is full the scala vestibuli that the cochlea. This tide is sent throughout Reissner’s membrane (the roof the the cochlear duct) right into the endolymph of the cochlear duct. It climate passes with the tectorial membrane, which forms a roof to safeguard the body organ of Corti, into the body organ of Corti. The body organ of Corti contains sensory cells with hairlike projections, dubbed hair cells, that space deformed through the development of the wave. The hair cells cause nerve impulses that take trip along the cochlear nerve, a branch of the hear nerve, come the brain, whereby they are understood as sound. The sound wave then passes right into the perilymph the the scala tympani, wherein it reasons a second membrane-covered opening into the center ear, the ring window, to bulge outward and also dampen the tide in the perilymph. The specific physical system of hearing—i.e., the traveling of waves along the basilar membrane—was an initial correctly explicated by the Hungarian American physicist Georg von Békésy in the mid-20th century.

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There space actually 2 labyrinths the the inner ear, one within the other, the membranous labyrinth had within the...