- Rudimentary otocysts
: These are millimetric representations of the otic capsule without an internal acoustic canal.
The cochlear duct begins to develop as an out-pocketing of the otocyst at E11.5.
In early development, they, respectively, define the medial and lateral sides of the otocyst, and as the sensory patches are innervated, Pax2 is downregulated in the prosensory domain.
Tomarev, "Expression of Prox1 defines regions of the avian otocyst that give rise to sensory or neural cells," Journal of Comparative Neurology, vol.
Thus the present study aimed to observe morphological changes of developing inner ear using the organ-cultured otocyst of the chick.
These characters are similar to mammalian otocyst (Morsli et al., 1998), suggesting a conserved morphogenesis of the otocyst among vertebrates.
Obviously, the otocyst is lined by a stratified epithelium and the epithelial invagination can be seen in the middle region of the otocyst (Fig.
The fact that there is no connection between the otocyst and the brainstem is a contraindication to CI surgery.
Definite and possible indications for auditory brainstem implantation Indications Definite Complete labyrinthine aplasia (Michel) Rudimentary otocyst Cochlear aplasia Cochlear aperture aplasia Cochlear nerve aplasia Incomplete partition type I, common cavity, cochlear hypoplasia with no cochlear nerve Indications Possible Cochlear nerve deficiency Incomplete partition I and common cavity where distribution of cochlear nerve is not predictable Cochlear hypoplasia with hypoplastic CN Unbranched cochleovestibular nerve TABLE 2.
The hindbrain (hb) develops just posterior to any retinal tissue, but the otocysts have been deleted.
Not shown in Figure 3F, the otocysts are irregular in size and shape and are just posterior to the eyes.