Archive image from page 153 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 134 THE DEVELOPMENT OF THE CHICK : Fig. 71. —Entire embryo of 16 s, drawn from above as a transparent object. Note the cranial flexure; the rotation of the head on its left side is beginning. ' au. P., Auditory pit. F. B., Fore-brain. H. B. 1, First division of the hind brain. H. F. Am., Head-fold of the amnion. Hm. F., Hyomandibular furrow. Pr'am., Proam- nion. M. B., Mid-brain, op. Ves., Optic vesicle, pr. str., P
Archive image from page 153 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 134 THE DEVELOPMENT OF THE CHICK : Fig. 71. —Entire embryo of 16 s, drawn from above as a transparent object. Note the cranial flexure; the rotation of the head on its left side is beginning. ' au. P., Auditory pit. F. B., Fore-brain. H. B. 1, First division of the hind brain. H. F. Am., Head-fold of the amnion. Hm. F., Hyomandibular furrow. Pr'am., Proam- nion. M. B., Mid-brain, op. Ves., Optic vesicle, pr. str., Primitive streak, s 2, s 4, s 16, Second, fourth, and sixteenth somites. V. o. m., omphalo-mesenteric vein. VII-VIII, The acustico-facialis primordium. IX-X, Primordium of the glossopharyngeus and vagus. The entire trunk tends also to bend vent rally, , to develop a dorsal convexity, and this approximates its posterior end to the tip of the head. These flexures are characteristic of amniote
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