. The development of the chick; an introduction to embryology. Birds -- Embryology. \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 als
. The development of the chick; an introduction to embryology. Birds -- Embryology. \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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947. New York, Holt
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