Archive image from page 113 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 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 &o. â £tt. -prjr. Fig. 48. â Stage of first intersomitic groove drawn from an entire mount in balsam by transmitted light. a. c. v., Amnio-card
Archive image from page 113 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 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 &o. â £tt. -prjr. Fig. 48. â Stage of first intersomitic 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 alreadv formed, Iving a short distance in front of the thickened ectoderm destined to form the auditory pit.
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