発生過程における鶏小脳の migration layer について

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  • Migration Layers of the Developing Cerebellum in the Fowl
  • ハッセイ カテイ ニ オケル ニワトリ ショウノウ ノ migration l

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The migration layer (Migr.) developed from the neural epithelium of the fowl cerebellum was investigated on the basis of Rudeberg's findings [22] in various vertebrates. Migr. A, the first migration layer originated from the neural epithelium, appeared in stage HH 19-20 (ca. 3-day-old embryo). Migr. B was formed in stage HH 27 (ca. 5-day-old embryo) when Migr. A was divided into a dorsal cell mass, A2, and a ventral one, A1. In this stage A2B was also formed between A2 and B. As in mammals, B2 in stage HH 30 (ca. 6.5-day-old embryo) and B3 in stage HH 31 (ca. 7-day-old embryo) differentiated from Migr. B. These results obtained from birds agreed with those reported in mammals, except that any portion corresponding to B4 in mammals was not found in chick embryos examined. The external granular layer differentiated from A2 in stage HH 29 (ca. 6-day-old embryo). The superficial portions of B, B2 and B3 condensed into dense areas, which served the primordium of the ganglion cell layer. The borders among them were clear at the interruption, but became gradually indistinct after stage HH 38 (ca. 12-day-old embryo). Then the cerebellar cortex showed such uniform pattern of histological structure as seen in adult animals.

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