. The development of the chick; an introduction to embryology . Somp. \ 3// ■■■^(■■1 ■^^■w^ ^lp^^l,^ ^\^. CiiS D. 126 THE DEVELOPMENT OF THE CHICK stage (Figs. 63 and 65) to a ))()int a little behind the last meso-blastie somite; beyond this the medullary folds diverge and arelost to view towards the hind end of the i)rimitive streak. Wemay distinguish a cephalic portion (brain or encephnlon) and atrunk portion (spinal cord or myclon) of the neural tube; theboundary lies between the fourth and fifth somites, for the firstfour somites enter into the composition of the head. The brainis thus at
. The development of the chick; an introduction to embryology . Somp. \ 3// ■■■^(■■1 ■^^■w^ ^lp^^l,^ ^\^. CiiS D. 126 THE DEVELOPMENT OF THE CHICK stage (Figs. 63 and 65) to a ))()int a little behind the last meso-blastie somite; beyond this the medullary folds diverge and arelost to view towards the hind end of the i)rimitive streak. Wemay distinguish a cephalic portion (brain or encephnlon) and atrunk portion (spinal cord or myclon) of the neural tube; theboundary lies between the fourth and fifth somites, for the firstfour somites enter into the composition of the head. The brainis thus at this time about as long as the portion of the cord formedor indicated by the medullary folds. For description, seep. 108. Alimentary Canal. The alimentary canal and its appendagesexist only potentially in this eml)ryo in the forni of the splanchno-pleure, except in the head. The cephalic enteron of this stagecorresponds to a large part of the i:)harynx. The oral jilate hasalready been described in connection with the sagittal section(Fig. 67). In transverse section the extreme anterior end of thefore-gut is
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Keywords: ., bookcentury1900, bookdecade1900, bookiddevelopm, booksubjectbirds
