From the posterior wall of the saccule a canal, the endolymphatic duct, is given off; this duct is joined by the ductus utriculosaccularis, and then passes along the aquaeductus vestibuli and ends in a blind pouch (endolymphatic sac) on the posterior surface of the petrous portion of the temporal bone, where it is in contact with the dura mater.

Disorders of the endolymphatic duct include Meniere's Disease and Enlarged Vestibular Aqueduct.

• Transverse section through head of fetal sheep, in the region of the labyrinth. X 30.
• Transverse section of a human semicircular canal and duct

This article incorporates text in the public domain from page 1052 of the 20th edition of Gray's Anatomy (1918)

• The Endolymphatic Duct and Sac

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