otocyst


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otocyst

[′ōd·ə‚sist]
(embryology)
The auditory vesicle of vertebrate embryos.
(invertebrate zoology)
An auditory vesicle, otocell, or otidium in some invertebrates.
References in periodicals archive ?
1,2] Should inner ear development be interrupted between the fourth and fifth weeks of gestation after differentiation of the auditory placode into the otocyst, but before division of the latter into the primordium of the cochlea, vestibule, and semicircular canals--a "common cavity" forms that has no internal architecture (figure).
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.