Archive image from page 113 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 94 THE DEVELOPMENT OF THE CHICK of very flat cells. The lateral extensions may be regarded as diverticula; subsequently these grow more rapidly at four places along their length, and come in contact with the ectoderm. Thus four pouches are established on each side as described in detail Fig. 48. -— Stage of lirst intcrsomitic groove drawn from an entire mount in balsam by transmitted light. a. c. v., Amnio-cardiac vesicle, a. o., In-
Archive image from page 113 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 94 THE DEVELOPMENT OF THE CHICK of very flat cells. The lateral extensions may be regarded as diverticula; subsequently these grow more rapidly at four places along their length, and come in contact with the ectoderm. Thus four pouches are established on each side as described in detail Fig. 48. -— Stage of lirst intcrsomitic groove drawn from an entire mount in balsam by transmitted light. a. c. v., Amnio-cardiac vesicle, a. o., In- ner margin of Area opaca. Ect., Ectoderm. Ent., Entoderm H. F., Head-fold, , First intersomitic furrow, med. pi., Medullary plate. Mes., Mesoderm, n. gr., Neural groove, pr gr., Primitive groove. Pr'a, proamnion. in the next chapter. At the 12 s stage one such place of contact is already formed, lying a short distance in front of the thickened ectoderm destined to form the auditory pit.
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