a circumscribed dilation of one extremity of each of the three bony semicircular canals, anterior, posterior, and lateral; each contains an ampulla of the semicircular ducts. Syn: ampulla ossea [NA], osseous ampulla.
Health4All
a circumscribed dilation of one extremity of each of the three bony semicircular canals, anterior, posterior, and lateral; each contains an ampulla of the semicircular ducts. Syn: ampulla ossea [NA], osseous ampulla.