Anatomy of inner ear | special senses

Inner ear, also called labyrinth of the ear, part of the ear that contains organs of the senses of hearing and equilibrium. The bony labyrinth, a cavity in the temporal bone, is divided into three sections: the vestibule, the semicircular canals, and the cochlea. Within the bony labyrinth is a membranous labyrinth, which is also divided into three parts: the semicircular ducts; two saclike structures, the saccule and utricle, located in the vestibule; and the cochlear duct, which is the only part of the inner ear involved in hearing. The cochlear duct forms a shelf across the cochlea dividing it into two sections, the scala vestibuli and the scala tympani. The entire inner ear is bathed in a cushioning fluid, called the endolymph when it lies within the membranous labyrinth and the perilymph when it separates the bony and membranous labyrinths.
human ear: Inner ear
There are actually two labyrinths of the inner ear, one inside the other, the membranous labyrinth contained within the bony labyrinth. The bony labyrinth consists of a central chamber called the vestibule, the three semicircular canals, and the spirally coiled cochlea.
ear disease: Inner ear
The labyrinth of the inner ear contains the nerve endings of the vestibular nerve-the nerve of equilibrium-and the auditory nerve, which are branches of the vestibulocochlear, or eighth cranial, nerve. The vestibular nerve ends supply the semicircular canals and the otolithic membranes in…
nervous system
human nervous system: Sensory receptors
…of the head within the inner ear. Inside each end organ are the hair cells, the detection units for both linear and angular acceleration. Extending from each hair cell are fine, hairlike cilia; displacement of the cilia alters the electrical potential of the cell. Bending the cilia in one direction…
Inner ear
Human ear
Vestibular system
Organ of Corti
Macula utriculi
Macula sacculi
Hair cell
Bony labyrinth
Otolith
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