Vestibular Ganglion Cells in Developing Chick Embryo

Creators Yamashita Hiroshi

Creators Sekitani Toru

Creators Endo Shiro

Creators Shimogori Hiroaki

Creators Okami Kenji

The morphologic development of the vestibular ganglion and nerve and otic vesicle in the enbryos of White Leghorn chicken was studied n chick embryos from 3.5 days of age up to one day after hatching. In 3.5-day-old chick embryos, the seventh and eighth aranial nerve ganglia appeared as a single facial-acoustic ganglion mass near the otocyst. In 4-day-old chick embryos, a facial-acoustic ganglion mass was divided into the two parts, the primitive stato-scountic ganglion medially and the primitive geniculate ganglion laterally. The vestibular and spiral ganglia from the stato-acoustic ganglion were competely separated in 6-day-old chick embryos. Penetration of vestibular nerve fibers into the sensory area of the otocyst took place in chick embyos incubated during 6 to 8 days, since the macula statica and crista ampullaris appeared in 6-7-day-old and in 7-8-day-old chick enbryos, respectively. In 12-day-old chick embryos, vestibular ganglion cells were arranged regularly in the direction proceeding from cells present in the ganglion.

[ISSN]0513-1812

[NCID]AA00594272