The portion of the membranous labyrinth of the ear into which the semicircular ducts find their outlet.
hog:0000246 anterior semicircular ducthog:0000247 lateral semicircular ducthog:0000248 posterior semicircular ducthog:0000634 utricle epitheliumhog:0001344 crus communeBFO:0000050 part of
hog:0001676
tao:0000700