Semicircular Ducts

**Definition:** The three membranous semicircular ducts within the bony semicircular canals. They open into the UTRICLE through five openings. Each duct has at one end a sensory area called the ampullary crest. AMPULLARY HAIR CELLS of the crests sense the movement of ENDOLYMPH resulting from rotation of the head.

**Tree numbers:** - A09.246.300.663.500 - A09.923.125