semicircular ear canal


semicircular ear canal
fluid-filled canals embedded in the cranium and concerned with balance and hearing. Gnathostomata have 3 canals, lampreys have 2 (lacking a horizontal canal), and hagfishes have only one canal, perhaps appearing secondarily by the joining of two canals. Fossil Cyclostomata my have had 7 or more semicircular canals. Each canal and otolith camera has an inner area (the macula or spot) covered with a receptor epithelium

Dictionary of ichthyology. 2009.

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