Archive image from page 126 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO T\VEL'E SOMITES 107 ceph. Mes End' Pig 62. — The head of the same embryo from beneath more highly magnified. In this drawing an attempt is made to show different levels of the embryo superposed: thus the heart is uppermost in the figure, beneath this the fore-gut (F. G.), beneath this the notochord, and at the lowest level, the neural tube, a. c. s., Anterior cerebral suture. Inf., Infundibulum. p. C
Archive image from page 126 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO T\VEL'E SOMITES 107 ceph. Mes End' Pig 62. — The head of the same embryo from beneath more highly magnified. In this drawing an attempt is made to show different levels of the embryo superposed: thus the heart is uppermost in the figure, beneath this the fore-gut (F. G.), beneath this the notochord, and at the lowest level, the neural tube, a. c. s., Anterior cerebral suture. Inf., Infundibulum. p. C, represents the anterior boundary of the parietal cavity, or. pi., Oral plate, v. Ao., Ventral aorta. Other abbreviations as before. is no clear distinction between brain and cord at first, the one passing without any anatomical landmark into the other. Now the brain is the central nervous system of the head, so it is not until one can determine the posterior boundary of the embryonic head that it becomes possible to determine the hind end of the
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