. The development of the chick; an introduction to embryology. Birds -- Embryology. 248 THE DEVELOPMENT OF THE CHICK from the recessus opticus to the region between the foramina of Monro. It is very thin, excepting near its center, where it is thickened to form the torus transversus, containing the anterior commissure. At its dorsal summit it is continuous with the roof of the telencephalon medium, which has formed a pouch- like evagination, the paraphysis. Just behind the paraphysis. Fig. 149. — Median sagittal section of the brain of a chick embryo of 7 days. (After v. Kupffer.) c, Cerebellu
. The development of the chick; an introduction to embryology. Birds -- Embryology. 248 THE DEVELOPMENT OF THE CHICK from the recessus opticus to the region between the foramina of Monro. It is very thin, excepting near its center, where it is thickened to form the torus transversus, containing the anterior commissure. At its dorsal summit it is continuous with the roof of the telencephalon medium, which has formed a pouch- like evagination, the paraphysis. Just behind the paraphysis. Fig. 149. — Median sagittal section of the brain of a chick embryo of 7 days. (After v. Kupffer.) c, Cerebellum, ca., Anterior commissure, cd., Notochord. ch., Pro- jection of the optic chiasma. cp., Posterior commissure, e., Epiphysis, e'., Paraphysis. hy., Hypophysis. I., Infundibulum. It., Lamina termi- nahs. Lop., Optic lobe. M., Mesencephalon. Mt., Metencephalon. opt., Chiasma of the optic nerves, p., Parencephalon. ro., Recessus opticus, s., Saccus infundibuH. se., Synencephalon. tp., Mammillary tubercle, tp., Tuberculum posterius. tr., Torus transversus. Tr., De- cussation of the trochlear nerves. Va., Velum medullare anterius. Vi., Ventriculus impar telencephali. vp., Velum medullare posterius. is the velum transversum, where the roof bends upwards sharply into the roof of the diencephalon. The epithelial wall around the bend is folded to form the choroid plexus of the third ven- tricle, which is continued forward into the lateral ventricle along. 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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