anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical structure; "he has good bone structure"

inner ear, internal ear, labyrinth - a complex system of interconnecting cavities; concerned with hearing and equilibrium

utricle, utriculus - a small pouch into which the semicircular canals open

saccule, sacculus - a small sac or pouch (especially the smaller chamber of the membranous labyrinth)