Archive image from page 123 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 -ytv: /y. Fig. 59. — Embryo of 7 s from above drawn in balsam with transmitted light, x 30. a. c. s., Anterior cerebral suture, ceph. Mes., Cephalic Mesoblast. F. G., Fore-gut. N'ch., Notochord. n. T., Neural tube. op. Ves., Optic vesicle. Pr'a., Proamnion, pr. str., Primitive streak, s 2, s 7, Second and seventh somites. V. o. m., Omphalo-mes- enteric vein.

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