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

inner ear, additionally called labyrinth that the ear, component of the ear that consists of organs that 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. Within the bony labyrinth is a membranous labyrinth, i beg your pardon is additionally divided right into three parts: the semicircular ducts; 2 saclike structures, the saccule and also utricle, situated in the vestibule; and the cochlear duct, which is the only component of the inside ear involved in hearing. The cochlear duct creates a shelf throughout the cochlea splitting it into two sections, the scala vestibuli and the scala tympani. The entire inner ear is bathed in a cushioning fluid, referred to as the endolymph as soon as it lies in ~ the membranous labyrinth and also the perilymph when it off the bony and membranous labyrinths.

Hearing

In the cochlea, both the bony labyrinth and also the cochlear duct room coiled in a shape resembling the of a snail shell. Relaxing along the basilar membrane, which forms the basic of the cochlear duct, is an plan of sensory cells and supporting cells well-known as the organ of Corti. This swarm of cells varies in thickness, for this reason that various regions within the cochlea space sensitive to various wavelengths that sound. As soon as sound waves space conducted throughout the skeleton of the center ear, they reason the oval window (a membranous opening in between the middle and inner ears) to relocate in and also out along with the stapes the the middle ear, to which it is attached. The movement of the oval home window sets up a wave in the perilymph pour it until it is full the scala vestibuli of the cochlea. This wave is sent throughout Reissner’s membrane (the roof of the cochlear duct) right into the endolymph of the cochlear duct. It climate passes v the tectorial membrane, which creates a roof to protect the organ of Corti, right into the organ of Corti. The organ of Corti contains sensory cells through hairlike projections, referred to as hair cells, that are deformed by the progression of the wave. The hair cells create nerve impulses that take trip along the cochlear nerve, a branch that the auditory nerve, to the brain, whereby they are taken as sound. The sound tide then passes into the perilymph of the scala tympani, where it reasons a second membrane-covered opening right into the middle ear, the ring window, come bulge outward and dampen the wave in the perilymph. The precise physical mechanism of hearing—i.e., the traveling of waves follow me the basilar membrane—was first correctly explicated through the Hungarian American physicist Georg von Békésy in the mid-20th century.

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There are actually 2 labyrinths that the inner ear, one inside the other, the membranous labyrinth contained within the...