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Saemicircular ducts

saemicircular ducts
Three small membranous tubes in the bony saemicircular canals that lie within the bony labyrinth and form loops of about two-thirds of a circle. The three (anterior saemicircular duct, lateral saemicircular duct, and posterior saemicircular duct) lie in planes at right angles to each other and open into the vestibule by five openings of which one is common to the anterior and lateral ducts. Each duct has an ampulla at one end within which filaments of the vestibular nerve terminate.
Synonym: ductus saemicirculares.

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