. The development of the chick; an introduction to embryology. Birds -- Embryology. THE NERVOUS SYSTEM 245 and 150 show median and lateral sagittal sections of the same stage. The flexures of the brain at this stage are: (1) the cranial flexure marked by the plica encephali ventralis on the ventral surface, (2) the cervical flexure at the junction of myelencephalon and cord, somewhat reduced in this stage, and (3) the pontine flexure, a ventral projection of the floor of the myelencephalon. 0/A Fig. 147. — Dissection of the brain of an 8-day chick. For description see text. The arr
. The development of the chick; an introduction to embryology. Birds -- Embryology. THE NERVOUS SYSTEM 245 and 150 show median and lateral sagittal sections of the same stage. The flexures of the brain at this stage are: (1) the cranial flexure marked by the plica encephali ventralis on the ventral surface, (2) the cervical flexure at the junction of myelencephalon and cord, somewhat reduced in this stage, and (3) the pontine flexure, a ventral projection of the floor of the myelencephalon. 0/A Fig. 147. — Dissection of the brain of an 8-day chick. For description see text. The arrows shown in the figure lie near the dorsal and ventral boun- daries of the foramen of Monro. ch. PI., Choroid plexus. Com. ant., Anterior commissure. Com. post., Posterior commissure. C. str., Corpus striatum. Ep., Epiphysis. H., Hemisphere. Hyp., Hypophysis. L. Lamina terminalis. Myel., Myel- encephalon. olf., Olfactory nerve, op. N., Optic chiasma. op. L., Optic lobe. Par., Paraphysis. Paren., Parencephalon. pi. enc. Plica en- cephali ventralis. pont. Fl., Pontine flexure. Rec. op., Recessus opticus. S. Inf., Saccus infundibuli. Tel. Telencephalon medium. Th., Tha- lamus. T. Torus transversus. Tr., Commissura trochlearis. X. J^?.^^^^^ ^~^' ^~^' ^~^' *^"^' ^"«' ^-f' represent the planes of section A, B, C, D, E, and F of Fig. 151. Telencephalon. The telencephalon is bounded posteriorly, as noted in the last chapter, by the line drawn from the velum transversum to the recessus opticus. The telencephalon medium has grown but little since the fourth day, but the hemispheres. 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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