Archive image from page 120 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 Jom'fi/. 7CY)p/'j>/. •;..-?-»i?~= Fig. 54. — Transverse section through the same embryo a short distance in front of the anterior intestinal portal. For explanation of letters see preceding figure; in addition: Ph., Pharynx. Som'pl., Somatopleure. Spl'pl., Splanchnopleure. v. M., Ventral Mesentery. Fig. 54 A. — Transverse section through the head of a 10 s embryo. The region of the section is near the center of the hind brain. Ao.,
Archive image from page 120 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 Jom'fi/. 7CY)p/'j>/. •;..-?-»i?~= Fig. 54. — Transverse section through the same embryo a short distance in front of the anterior intestinal portal. For explanation of letters see preceding figure; in addition: Ph., Pharynx. Som'pl., Somatopleure. Spl'pl., Splanchnopleure. v. M., Ventral Mesentery. Fig. 54 A. — Transverse section through the head of a 10 s embryo. The region of the section is near the center of the hind brain. Ao., Aorta. End'c, Endocardium. End'c. S., Endocardial septum. H. B., Hind brain. My'c, Myocardiiun. p. C, Parietal cavity. Ph., pharynx. So'pl., Somatopleure. Spl'pl., Splanchnopleure. v. M., Ventral mesentery. The Neuropore. From the place where the neural folds first meet, the elevation and fusion proceed both forwards and back- wards in a continuous fashion (cf. Figs. 59, 61, 65, etc.). Although the open anterior stretch of the neural tube is very short in com- parison to the posterior open part, it is not until about the 12 s
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