Saccule

Sacculus

Sensory (eye & ear)OrgansHeadLeft and right

View left in 3D View right in 3D

What it is

A smaller, rounded membranous sac in the front lower part of the vestibule, joined to the cochlear duct by the tiny ductus reuniens; its macula stands vertically on its medial wall.

Function

Senses vertical linear acceleration (as in a lift) and head tilt in the sagittal plane.

Size

About 2-3 mm across; macula about 2 mm.

Clinical note

Its response to loud clicks is the basis of the cervical VEMP test of vestibular function.