cavity of concha
cav·i·ty of con·cha[TA]
the space within the lower, larger portion of the concha below the crus helicis; it forms the vestibule leading into the external acoustic meatus.
cav·i·ty of con·cha(kavi-tē kongkă) [TA]
Space within lower, larger portion of the concha below crus helicis; forms vestibule leading into external acoustic meatus.