BPK 306 Lecture Notes - Lecture 30: Frontal Lobe, Cilium, Arcuate Fasciculus
5 Dec 2017
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External, middle, and inner ear: tympanic membrane -> turns air waves into mechanical, and then a fluid signal. Sound (compression and decompression) waves strike the tympanic membrane and cause movement of the ossicles in the middle ear: these transmit waves to the cochlea, cochlea = fluid-filled labyrinth-like structure containing hair cells. The cochlea is easier to understand when uncoiled. Basilar membrane separates 2 fluid-filled cavities (scala vestibuli and scala tympani) A third compartment (scala media) contains hair cells that detect sound. Hair cells are specialized receptor cells sitting on the basilar membrane that detect movement. When the basilar membrane moves, this mechanically stimulates hair cells that convey frequency-dependent information to cochlear afferents. 2: the organ of corti contains hair cells = where transduction occurs. Sound waves that reach the inner ear cause the tympanic membrane to oscillate. Cilia arranged in order of height, connected via tip-links attaching to next tallest cilium.
