Archive image from page 117 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 MM mm mm â J â Si 'U 1 ( i Fig. 52. â The same embryo from beneath. a. c. v., Amnio-cardiac vesicle, a. i. p., Anterior intestinal portal. H. F., Head-fold. Pr'a., Proamnion. the neural folds (Figs. 51 and 56). The latter rise very rapidly, thus deepening the neural groove, and bend in towards the middle line (Figs. 53,54, etc.,) meeting,by the time four or five somites are

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