Archive image from page 121 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 ax. Mes. 'S. / Mes. N Fig. hb. â Transverse section through the head immediately behind the optic vesicles; stage, 10 s. Ao., Aorta, ax. Mes., Axial mesoblast. Ect., Ectoderm. Ent., Entoderm. F. B., Fore-brain. Mes., Mesoderm, or. pi., Oral plate, p'a. c, Periaxial cord. p. C. Parietal cavity. Pr'a., Proamnion. Ph., Pharynx, v. Ao., Ventral aorta. axis. It is identified by these writers with the permanent neuro- pore of Amphioxus
Archive image from page 121 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 ax. Mes. 'S. / Mes. N Fig. hb. â Transverse section through the head immediately behind the optic vesicles; stage, 10 s. Ao., Aorta, ax. Mes., Axial mesoblast. Ect., Ectoderm. Ent., Entoderm. F. B., Fore-brain. Mes., Mesoderm, or. pi., Oral plate, p'a. c, Periaxial cord. p. C. Parietal cavity. Pr'a., Proamnion. Ph., Pharynx, v. Ao., Ventral aorta. axis. It is identified by these writers with the permanent neuro- pore of Amphioxus. However, this is open to question. Poste- riorly the closure of the neural tube proceeds much more rapidly, though, of course, it is not fully completed until after the disap- pearance of the primitive streak. â F. '--;§_?& mmiSifs& mmmmm ?3£Ect. ®l«5;i?'- A'U Fig. 56. â Early stage of the neural folds. Transverse section through a 4-5 s embryo between the last somite and the anterior end of the primitive streak. Ect., Ectoderm. Ent., Entoderm, n. F., Neural fold. N'ch., Noto- chbrd. med. pi., Medullary plate. Mes., Mesoderm. The question as to the position of the anterior end of the original neural axis is one of great morphological significance. Accompanying the closure of the neural tube in this region the
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