Archive image from page 122 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 .sc ;'' â ? yT/. '\;': 6-:/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P\, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the
Archive image from page 122 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 .sc ;'' â ? yT/. '\;': 6-:/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P\, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the neural tube does not, however, take part in this extension, the consequence being that the sum- mits of the neural folds form arching knees extending in front of the original anterior end of the medullary plate (Figs. 51 and 52). The extreme anterior end of the neural tube formed in this way has a ventral as well as a dorsal defect, and when it closes there is a ventral as well as a dorsal suture. The end of the ventral suture marks the original anterior end of the me-' dullary plate, and this lies at the stage of 10 somites a short distance in front of the ante- Fig. 58. â Ventral view of the head rior end of the oral plate in region of an embryo of 5 somites, the region of the future re- drawn in balsam with transmitted cessus opticus (lig. 62). (Go- » ⢠r ⢠i ' a. c. v., Amnio-cardiac vesicle. ronowitsch calls the anterior a. i. Anterior intestinal portal. fissure, mtura cerehralis ante- mm''MT'â¢'''T°'''''i' ' _ Nch., Notochord. , Neural fold. rior; His divided it into two s 2, s 4, Second and fourth somites. /Ko5.
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