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1. The structure formed by invagination of the embryonic ectodermal tissue that develops into the inner ear.
2. A statocyst.

o′to·cys′tic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Zoology) another name for statocyst
2. (Zoology) the embryonic structure in vertebrates that develops into the inner ear in the adult
ˌotoˈcystic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈoʊ tə sɪst)

2. one of a pair of pouches that form in the front part of the embryo by the infolding of a thickened area of ectoderm.
o`to•cys′tic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
- Rudimentary otocysts: These are millimetric representations of the otic capsule without an internal acoustic canal.
After the development of the otic vesicle, the otocyst gives rise to the mature IE structures, including the vestibular system in the dorsal plane and the auditory system in the ventral plane.
In contrast, Sox2 is expressed in the neural tube and dorsolateral regions of murine otocysts at embryonic day 9.5 (E9.5), which is consistent with a role in sensory organ development.
At E9.5, Pax2 was expressed throughout the epithelium of the otic otocyst, but it was more concentrated in the centro-medial area next to the neural tube.
The otocysts (otic vesicles) with no periotic mesenchymal tissues were carefully dissected from embryonic day, E2.5-4.5-embryos and then pooled in cold PBS, pH 7.2.
Embryonic otocysts were isolated from E2.5-4.5 embryos.
Let's see what can be done with their names: SCOTTY ta1 = otocyst SCOTTY ta2 = boycotts, cryostat, otocysts MOORE tp = Romeo MOORE ta1 = boomer, mooner, moored, morose, roomie MOORE ta2 = bedroom, boredom, doormen, groomed, hormone, promote SCOTTY MOORE ta5 = cytophotometries SCOTTY MOORE ta6 = spectrophotometry BILL ta1 = billy, brill, libel BILL ta2 = billet, billow, glibly, liable BLACK ta1 = blacks BLACK ta2 = backlit, backlog, becloak, layback BILL BLACK ta3 = blackballing FONTANA ta1 = nonfatal FONTAN A ta3 = nonfactual FLOYD ta1 = fondly FLOYD ta2 = dropfly, twyfold CRAMER ta1 = charmer, creamer, marcher CRAMER ta2 = carmaker, creamery, screamer
The otocysts contain smaller otoliths, and they are irregular in shape; the heart tube is attached by a thin strand of cells to the pericardial wall; and blood cells pool on the ventral side of the embryo at the level of the hindbrain and along the length of the tail.
The hindbrain (hb) develops just posterior to any retinal tissue, but the otocysts have been deleted.