Inner ear hair cells. Coloured scanning electron micrograph (SEM) of sensory hair cells from the organ of Corti, in the cochlea of the inner ear. These are the outer rows of hairs. These cells are surrounded by a fluid called the endolymph. As sound enters the ear it causes waves to form in the endolymph, which in turn cause these hairs to move. The movement is converted into an electrical signal, which is passed to the brain. Each V- shaped arrangement of hairs lies on the top of a single cell. Magnification: x8500 when printed 10cm wide.

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