Archive image from page 169 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 Sp/'/)/. /?./ L ' Pr'a. op. St. Fig. 84. — Transverse section through the fore-brain and optic vesicles of a 16-s embryo. Am. F., Amniotic fold. Ectam., Ectamnion. L., Left side, , Optic stalk. R., Right side. Other abbreviations as before. however, difficult to establish an exact line of demarcation be- tween the two subdivisions of the primary fore-brain, until about the 18 to 20 s stage, when a slight transverse fold or inden
Archive image from page 169 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 Sp/'/)/. /?./ L ' Pr'a. op. St. Fig. 84. — Transverse section through the fore-brain and optic vesicles of a 16-s embryo. Am. F., Amniotic fold. Ectam., Ectamnion. L., Left side, , Optic stalk. R., Right side. Other abbreviations as before. however, difficult to establish an exact line of demarcation be- tween the two subdivisions of the primary fore-brain, until about the 18 to 20 s stage, when a slight transverse fold or indentation in the roof (velum transversum) gives a dorsal landmark (Figs. 73, 85); the recessus opticus forms the ventral boundary between the two. The velum transversum lies a considerable distance above the dorsal end of the lamina terminalis, but it is difficult to say just how far, owing to the indefiniteness of this point for some time after the disappearance of the neuropore. A line drawn between the velum transversum and the recessus opticus may be taken as the boundary between the two divisions of the
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