Archive image from page 169 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 150 THE DEVELOPMENT OF THE CHICK diameter of the fore-brain itself, though this is relatively slight up to twenty somites, but it enhances the general effect of the change in position of the optic stalk. The subsequent history of the optic vesicles is given beyond. (6) The delimitation of the tel- and diencephalon is initiated by a forward expansion of the anterior end of the primary fore- brain, which becomes the telencephalon or second
Archive image from page 169 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 150 THE DEVELOPMENT OF THE CHICK diameter of the fore-brain itself, though this is relatively slight up to twenty somites, but it enhances the general effect of the change in position of the optic stalk. The subsequent history of the optic vesicles is given beyond. (6) The delimitation of the tel- and diencephalon is initiated by a forward expansion of the anterior end of the primary fore- brain, which becomes the telencephalon or secondary fore-brain, the remainder being then known as the diencephalon or 'tween brain. The expansion proceeds very rapidly from the 14 s stage, and it is probable that it involves only the dorsal zones. It is, Ect<im £.E.£.C. c,ffi?:i.''-':mf. ££. /;3a-' -1 R .i .'9 f ' f Sp/'/)/.
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