Archive image from page 171 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 \r C/) opt. /?PC Opt D/enc Vtr\~, Te/enc Fig. 86. — Inner view of the brain of a chick of about 82 hours, drawn from a dissection. Ch. opt., Chiasma opticus. Ep., Epiphysis (pineal gland). Isth., Isth- mus. PI. enc. v., Plica encephali ventralis. Rec. opt., Recessus opticus. V. tr., Velum Transversum. Other abbreviations as before. The Diencejphalon. The portion of the primary fore-brain pos- terior to the telencephalon is known as the d
Archive image from page 171 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 \r C/) opt. /?PC Opt D/enc Vtr\~, Te/enc Fig. 86. — Inner view of the brain of a chick of about 82 hours, drawn from a dissection. Ch. opt., Chiasma opticus. Ep., Epiphysis (pineal gland). Isth., Isth- mus. PI. enc. v., Plica encephali ventralis. Rec. opt., Recessus opticus. V. tr., Velum Transversum. Other abbreviations as before. The Diencejphalon. The portion of the primary fore-brain pos- terior to the telencephalon is known as the diencephalon. It in- cludes the second and third neuromeres and probably also the ventral zones and floor of the first (Fig. 83). A slight constriction in the roof that appears about the 18 to 20 s stage near the junc- tion of the middle and last third may represent the boundary be- tween the second and third neuromeres; this persists for a long time and may be traced in the lateral walls to the region of the
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