LM of the cochlea of the human ear

LM of the cochlea of the human ear

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Credit: MANFRED KAGE/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of the human ear, showing the cochlea. The cochlea is a tapering, fluid-filled spiral cavity 3.5cm long. Two membranes run the length of the spiral & divide it into 3 parallel ducts. The cochlea's coils are here seen in section; bone is blue & the fluid-filled chambers white. In each coil, the upper membrane is tissue- thin; the lower, or basilar membrane, is thicker. The ducts they form are easily seen. In the middle duct, on the basilar membrane, is the Organ of Corti, where sensory hair cells react to sound & convert it into electrical signals which travel to the brain via the cochlear nerve. Magnification: x35 at 35mm size. (More information available). Ref: MICROCOSMOS, fig. 2.11, p. 20.

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Keywords: anatomy, auditory sense, basilar membrane, cochlea, hearing, human body, light micrograph, organ of corti

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