Archive image from page 115 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 giSifetfS' sz: — Fig. 50. — Embryo of 3 s from above, drawn in bal- sam with transmitted light. a. c. v., Amnio-cardiac vesicle, a. o., inner margin of Area opaca. F. G., Fore-gut. N'ch., Notochord. n. F., Neural fold. pr. gr., Primitive groove, s. l,s. 2, s. 3, First, second and third somites. successive stages may be studied in serial sections of the same embryo; an anterior section, for instance, showing the completed tube, o


Archive image from page 115 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 giSifetfS' sz: — Fig. 50. — Embryo of 3 s from above, drawn in bal- sam with transmitted light. a. c. v., Amnio-cardiac vesicle, a. o., inner margin of Area opaca. F. G., Fore-gut. N'ch., Notochord. n. F., Neural fold. pr. gr., Primitive groove, s. l,s. 2, s. 3, First, second and third somites. successive stages may be studied in serial sections of the same embryo; an anterior section, for instance, showing the completed tube, one farther back, the folded medullary plate, and yet more posteriorly the central part of the medullary plate disappears in


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