part of start stage end stage inner ear portion of tissue endolymphatic sac ZFA:0005912 zebrafish_anatomy TAO:0002194 Pouch at the end of the endolymphatic duct that helps regulates pressure on the inner ear. The endolymphatic sac is separated from the endolymphatic duct by a dynamic lamellar barrier. The lamellar barrier is composed of long, thin lamellar sheets that form tongue-and-groove structure or interwoven broadly overlapping structures. In adults, the endolymphatic duct and sac are partially encased within the temporal bone such that the distal end of the endolymphatic sac protrudes out of the temporal bone into the cranial cavity . 2019-04-16T14:25:54Z unknown adult