Archive image from page 156 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 Pjq 74, _ Head of the same embryo from the ventral side. Abbreviations as before. V /sfh. ///'Am. Fig 75. - Median sagittal section of the head of an embryo of 18 s H. F. Am., Head-fold of the amnion. P. Pharynx Isth Region o the isthmus pr'o. g., Preoral gut. or. pi., Oral plate. Rec. opt., Kecessus opticus! S 'v., Sinus venosus. Other abbreviations as before. immediately turns backwards over the head, forming a complete cap

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Archive image from page 156 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 Pjq 74, _ Head of the same embryo from the ventral side. Abbreviations as before. V /sfh. ///'Am. Fig 75. - Median sagittal section of the head of an embryo of 18 s H. F. Am., Head-fold of the amnion. P. Pharynx Isth Region o the isthmus pr'o. g., Preoral gut. or. pi., Oral plate. Rec. opt., Kecessus opticus! S 'v., Sinus venosus. Other abbreviations as before. immediately turns backwards over the head, forming a complete cap (Fio-s 67, 71, 75, etc.); the side Umbs of the head-fold are then elongated backwards, and are here known as the lateral fold, of the amnion; these rise up and arch over the embryo

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