Human anatomy, including structure and development and practical considerations . changes in position and relation which many parts ofthe human brain suffer during development, chiefly in consequence of the enormousexpansion of the pallium and the correspondingly large size of its commissure, the gp:neral dfaelopmknt of the hrain. 1063 corpus callosum. tlie fuiKiaiiu-ntul rdatioiiships incliaitccl by embryology arc of suchvalue that, e\en in thi- description of the adult origan, jri-oui)int^ of the various jxirtsof the brain upon a develop- Fio. 914. Kpillialiimus MttiithalaniusPars iiianiniil
Human anatomy, including structure and development and practical considerations . changes in position and relation which many parts ofthe human brain suffer during development, chiefly in consequence of the enormousexpansion of the pallium and the correspondingly large size of its commissure, the gp:neral dfaelopmknt of the hrain. 1063 corpus callosum. tlie fuiKiaiiu-ntul rdatioiiships incliaitccl by embryology arc of suchvalue that, e\en in thi- description of the adult origan, jri-oui)int^ of the various jxirtsof the brain upon a develop- Fio. 914. Kpillialiimus MttiithalaniusPars iiianiniillaris hypothalami mental basis is found acKan-tagcous. Althouijh strictadherence to such a planwould be at times inconven-ient, and, therefore, will notbe followed, constant refer-ence to primary relations isimperative. It will be con-venient, therefore, at thisplace, to call attention tothe accompanying outlinediagrams which illustratethe principles established byHis in his epoch-makingstudies of the human addition to showing thefive cerebral vesicles. Fie Tlialaiiiu. eseticephalon Pcdunculi cerebriIsthmus-Cfrcl)fllumPoms Medulla Dorsal zoneVentral zone Rhinencephalon Pars opticahypothalami ]• . .1 1 x-* • Diagram showing chief derivatives from cerebral visicles : based on 913 indicates the relative ^ brain of embryo of third month. (His.) position and extent of the two fundamental subdivisions of the lateral walls of the neural tube, the dorsalor alar and the venh-al or basal laminae, which play such important roles in thedifferentiation of the various parts of the brain-stem. Fig. 914 shows a laterstage, in which the genetic relations of all the more important parts of the brain maybe recognized. The greatest complexity is presented in the development of thederivations of the fore-brain, particularly of those which are differentiated from thediencephalon and later are found connected with the third ventricle. In order toset forth the developmental relations of t
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
