. The development of the chick; an introduction to embryology . lateral walls of the telencephalon medium are formed bythe posterior ends of the corpora striata and are therefore verythick. The lamina terminalis passes obliquely upwards and forwards cavity. Oes., Oesophagus, p. A., Pulmonary arch, par., Paraphysis. P. C,Pericardial cavity. Rec. op., Recessus opticus. R., Rectum. S. Inf., Saccusinfundibuli. T., Tongue. Tel., Med. Telencephalon medium. Tr., 1, 10, 20, 30, First, tenth, twentieth and thirtieth vertebral centra, r. auricle. Vel. tr., Velum transver
. The development of the chick; an introduction to embryology . lateral walls of the telencephalon medium are formed bythe posterior ends of the corpora striata and are therefore verythick. The lamina terminalis passes obliquely upwards and forwards cavity. Oes., Oesophagus, p. A., Pulmonary arch, par., Paraphysis. P. C,Pericardial cavity. Rec. op., Recessus opticus. R., Rectum. S. Inf., Saccusinfundibuli. T., Tongue. Tel., Med. Telencephalon medium. Tr., 1, 10, 20, 30, First, tenth, twentieth and thirtieth vertebral centra, r. auricle. Vel. tr., Velum transversum. V. o. m., Omphalomesentericvein. V. umb., Umbilical vein. 248 THE DEVELOPMENT OF THE CHICK from the recessus opticus to the region between the foramina ofMonro. It is very thin, excepting near its center, where it isthickened to form the torus transversus, containing the anteriorcommissure. At its dorsal summit it is continuous with theroof 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. Pro-jection of the optic chiasma. cp., Posterior commissure, e., Epiphysis,e., Paraphysis. hy., Hypophysis. I., Infundibulum. It., Lamina termi-nalis. Lop., Optic lobe. M., Mesencephalon. Mt., , Chiasma of the optic nerves, p., Parencephalon. ro., Recessusopticus, s., Saccus infundibuli. se., Synencephalon. tp., Mammillarytubercle, 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 sharplyinto the roof of the diencephalon. The epithelial wall aroundthe bend is folded to form the choroid plexus of the third ven-tricle, which is continued forward into th
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