The membranous labyrinth. (Ductus endolymphaticus labeled at bottom center.)
Endolymphatic duct is #6, and is labeled at top center.
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.
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