ANPS 019 Lecture Notes - Lecture 28: Tensor Tympani Muscle, Semicircular Canals, Eustachian Tube
26 Nov 2018
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Document Summary
Tympanic membrane eardrum separates external ear from the middle ear. Auditory ossicles 3 smallest bones in the body. Stapes attached to oval window of cochlea. Stapedius reduces movement of stapes at oval window. Converts sound waves at tympanic membrane into movement of fluids in membraneous labyrinth of cochlea. Auditory receptors lie within the organ of corti of the cochlea. The organ of corti rests on the basilar membrane. The auditory receptors, known as hair cells, have cilia that are in contact with the tectorial membrane. Movement of the basilar membrane causes movement of the cilia and depolarization of the hair cells. Sound frequency is mapped on the basilar membrane. The map is maintained in the cochlear nerve and cochlear nucleus in the brainstem. Earworms a portion of musical material that becomes stuck in a person"s head or repeats against one"s will within one"s mind.
