The sacs of the internal ear, known as the utricle and saccule, receive the impulses of the base of the stapes.
Anteriorly the saccule communicates with the membranous cochlea or scala media by a short ductus reuniens (fig. 2, dr).
Subsequently constrictions appear in the vesicle marking off the saccule and utricle.
saccule sac·cule (sāk'yōōl) or sac·cu·lus (-yə-ləs)
n. pl. sac·cules or sac·cu·li (sāk'yə-lī')
A small sac.
The smaller of two membranous sacs in the vestibule of the inner ear.