. The development of the chick; an introduction to embryology . ear the dorsal and ventral boun-daries of the foramen of Monro,ch. PI., Choroid plexus. Com. ant., Anterior commissure. Com. post.,Posterior commissure. C. Corpus striatum. Ep., Epiphysis. H.,Hemisphere. Hyp., Hypojjhysis. L. t., Lamina terminalis. Myel., Myel-encephalon. olf., Olfactory nerve, op. N., Optic chiasma. op. L., Opticlobe. Par., Parapliysis. Paren., Parencephalon. pi. ene. v., Plica en-cephali ventralis. pont. Fl., Pontine flexure. Rec. op., Recessus Inf., Saccus infundibuli. Tel. Telencephalon
. The development of the chick; an introduction to embryology . ear the dorsal and ventral boun-daries of the foramen of Monro,ch. PI., Choroid plexus. Com. ant., Anterior commissure. Com. post.,Posterior commissure. C. Corpus striatum. Ep., Epiphysis. H.,Hemisphere. Hyp., Hypojjhysis. L. t., Lamina terminalis. Myel., Myel-encephalon. olf., Olfactory nerve, op. N., Optic chiasma. op. L., Opticlobe. Par., Parapliysis. Paren., Parencephalon. pi. ene. v., Plica en-cephali ventralis. pont. Fl., Pontine flexure. Rec. op., Recessus Inf., Saccus infundibuli. Tel. Telencephalon medium. Th., Tha-lamus. T. Torus transversus. Tr., Commissura trochlearis. The lines a-a, h-h, c-c, d-d, e-e, f-f, represent the planes of section A,B, C, D, E, and F of Fig. 151. Telencephalon. The telencephalon is bounded jiostoriorly,as noted in the last chapter, by the line drawn from \\w vehmitransversum to the recessus opticus. The telencephalon mediumhas grown l)ut little since the fourth day, but the hemispheres 246 THE DEVELOPMENT OF THl*: CHICK. hui. 148.—iMtdian sagittal section of an embryo of eii^ht days. a. A., Aortic arch. All., Allaiitois. An., Anus. .\. o. Oin-l)halomcsenteric artery. B. F., Bursa Fal)ricii. h. P., Basilar A., Anterior c. C, Central canal. Cli. C. {)., posterior Conunissure. CI., Cloaca. Cr., Crop,d. Ao., Dorsal aorta. D. Hyp., Duct of the hypophysis. Ep., Epi-physis. Fis. Eus., Fissura Eustachii. Hem., Surface of hemispherebarely touched by section. Hyp., Hypophysis. L. Lamina ter-minalis. n. A. 8, neural arch of tli(> eighth vertei)r;i. Nas., Nasal THE NERVOUS SYSTEM 247 have expanded enormously, i)arti(nilarly anteriorly and dorsally,and their median surfaces are flattened against one another infront of the lamina terminalis, which forms the anterior boundaryof the telencephalon medium (Figs. 148, 149). Posteriorly thecerebral hemispheres extend to about the middle of the dien-ce
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