. The brain as an organ of mind. means of cell processes, exists between the radiatingfibres and the overlying ganglion, bringing them into arelation equivalent to the direct termination of fibresand cells. The portion of the Thalamus that actually has the ap-pearance of lying outside the ventricle, consists onlyof a prolongation from the body of the ganglion whichbends round the posterior edge of the crus, and curvesforwards in the roof of the descending cornu of thelateral ventricle, becoming pointed anteriorly. The Corpus Striatum is divided into two distinctparts by the radiating fibres of
. The brain as an organ of mind. means of cell processes, exists between the radiatingfibres and the overlying ganglion, bringing them into arelation equivalent to the direct termination of fibresand cells. The portion of the Thalamus that actually has the ap-pearance of lying outside the ventricle, consists onlyof a prolongation from the body of the ganglion whichbends round the posterior edge of the crus, and curvesforwards in the roof of the descending cornu of thelateral ventricle, becoming pointed anteriorly. The Corpus Striatum is divided into two distinctparts by the radiating fibres of the Crus which pass* See pp. 269, 270 note, aud fig. 122. Chap. XXITL] OF THE HUMAN BRAIN. 439 tlirougli it. The intra-ventricular portion consists of adeposit or bed of soft grey matter, not intermixed withdistinct fibres visible to the naked eye, thicker and wideranteriorly in the anterior cornu of the ventricle—narrow-ing to a point posteriorly. It rests upon the radiatingfibres of the tegmentum and thalamus which pass on-. ENS Fia. 157.—Transverse section of the Cerebrum, just behind V, Intra-ventricular, and SX, Extra-ventricular Corijus Striatum. Th, Thalamus,re, Crusta, andrt, Tegmentum of Crus Cerebri; R, radiating expansion of whitefibres (corona radiata); re. rt, and R together form what has been called theinternal capsule of the Lenticular Nucleus. Cx, external capsule (includingthe Claustrum); C, Corpus Callosum; FS, Fissure of Sylvius; LMG, Longitudinal Marginal Gyrus. S M G, S M G, Sylvian Marginal Gyrus ; , indicate lines of derivation of fibres of Corpus Striatum ;...., Fibres of distribution of Thalamus.(Broadbent.) wards beneath it to the hemisphere proper, Betweenthe bundles of radiating fibres this upper and anteriorportion is continuous with the lower and outer extra-ventricular portion of the Corpus Striatum, which is morebulky than the part already described, though it is, like it,also larger in front than behind. It is a somewhat pear
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