Archive image from page 123 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 104 THE DEVELOPMENT OF THE CHICK 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'eh., Notochord. n. T., Neural tube. op. Ves., Optic vesicle. Pr' Proamnion, pr. str., Primitive streak, s 2, s 7, Second and seventh somites. V. o. m., Omphalo-mes- enteric vein.
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