The anatomy of the nervous system, from the standpoint of development and function . stage in the development of any vertebrateembryo the rostral portion of the neural tube is distinguished from the caudalpart by the more rapid development of the former, its walls bulging outwardto form three bulb-like swellings or vesicles, which together represent the brain,and are named from before backward, the prosencephalon, mesencephalon, and 24 THE NEURAL IM;i WD Us DERIVATIVES 25 rhombencephalon (Fig. 7). The more rostral vesicle becomes subdivided by .1oonstriction into the telencephalon and dienceph
The anatomy of the nervous system, from the standpoint of development and function . stage in the development of any vertebrateembryo the rostral portion of the neural tube is distinguished from the caudalpart by the more rapid development of the former, its walls bulging outwardto form three bulb-like swellings or vesicles, which together represent the brain,and are named from before backward, the prosencephalon, mesencephalon, and 24 THE NEURAL IM;i WD Us DERIVATIVES 25 rhombencephalon (Fig. 7). The more rostral vesicle becomes subdivided by .1oonstriction into the telencephalon and diencephalon (Fig. 7, B, (>. The rhom-bencephalon is less sharply subdivided into a rostral pari, which includes thecerebellum, and is known as the metencephalon t and a more caudal portion, themyelencephalon. The optic nerves and retinae, not illustrated in the figure,develop as paired evaginations from the prosencephalon. The Cerebral Hemispheres. The telencephalon includes a thickened portionof the ventrolateral wall loosely designated as the corpus striatum or. since there -,f6-*t. Fig. 7.—Diagrams illustrating the development of the vertebrate brain: A, First stage, sideview, the cavity indicated by dotted line; B, second stage; C, third stage, side view of a brain with-out cerebral hemispheres; D, the same in sagittal section; E, fourth stage, side view of a brain withcerebral hemispheres; F, the same in sagittal section; G, dorsal view of the same with the cavitiesexposed on the right side. Rkin., rhinoccele; Lat. Vent., lateral ventricle; Int. For., interventricu-lar foramen; Vent. Ill, third ventricle; Vent. 71, fourth ventricle. /, Prosencephalon; / a. Telen-cephalon; / a-r, Rhinencephalon; 1 a-p. Pallium; 1 a-lt, Lamina terminalis; / a-ch, Cerebralhemisphere; 1 a-cs, Corpus striatum; 1 b, Diencephalon; 1 b-t, Thalamus. 2, Mesencephalon; 2 c,Optic lobes; 2 d, Crura cerebri, j, Rhombencephalon; j a, Metencephalon; 3 a-c, Cerebellum;3 b, Myelencephalon. is one of these on
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
