Identifier: anatomydescripti1897gray (find matches)
Title: Anatomy, descriptive and surgical
Year: 1897 (1890s)
Authors: Gray, Henry, 1825-1861 Carter, H. V. (Henry Vandyke), 1831-1897 Pick, T. Pickering (Thomas Pickering), 1841-1919
Subjects: Anatomy Human anatomy Anatomy, Surgical and topographical
Publisher: London : Longmans, Green
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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the growth of the cerebral hemispheres. Its cavity diminishes as its wallsthicken, and contracts to form the aqueduct of Sylvius. The epencephalon, or fourth secondary vesicle, is developed into the ponsVarolii and the cerebellum, and the metencephalon, or fifth secondary vesicle,forms the medulla. The cavity of these two secondary vesicles, which it will beremembered constituted the third primary vesicle, forms the fourth ventricle. The development of the pituitary body has of late received much attention.It is mainly formed by a diverticulum from the buccal involution of epiblast.At its upper and front part this involution, from which the mouth or stomodaeumis developed, forms a hollow saccular protrusion, which extends into the angleformed by the bend of the mid-brain. Here it comes in contact with a median DEVELOPMENT OP NEEVOUS CENTEES 95 Fig. 96.—Profile views of the brain of human embryos at three several stages,reconstructed from sections (His.) Copied from Quains Anatomy. M
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mc A. Brain of an embryo of about fifteen days, magnified 35 diameters. B. Brain of an enibiyo -ibout threeiand a half weeksold. The optic vesicle has tjeen cut away. c. Brain of an embryo about seven and a half weeks old. The optic stalkis cut through, A. Optic vesicle. H. Vesicle of cerebral hemisphere, first secondary vesicle. Z. Thalamen-cephalon, second secondary vesicle. M. Mid-brain. /. Isthmus between mid- and hind-brain. Rh. Fourthsecondary vesicle. N. Fifth secondary vesicle. Gh. Optic vesicle. Rf. Fourth ventricle. NK. Neck curvature.Br. Pons curvature. Pm.. Mammillary process. Tr. Infundibulum. Hp. (in b). Outline of hypophysis-fold ofbuccal epiblast. Rl. Olfactory fold. In c the basilar artery is represented along its whole course. 96 GENEEAL ANATOMY FiG- 97--—Section of the niedidlain the cervical region, at sixweeks. Magnified 50 diame-ters.

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