. Quain's elements of anatomy . nu-cleus caudatus of thecorpus striatum ; Vsl,ventricle of the septumlucidum ; Ccl~, section ofthe genu of the corpuscallosum; Pen, com-mencement of the pinealstria or peduncle, Tfo ;Cop, posterior commissure. cornu. Like the cho-roid plexuses of the4th and 3rd ven-tricles these also arehighly vascular andtheir ventricular sur-face is beset withvillus-like proj more obvious villi are again divided upon thek surfaces and attheir borders Into small processes along which fine vessels run, andthe epithelium of the ventricles is continued over their surf
. Quain's elements of anatomy . nu-cleus caudatus of thecorpus striatum ; Vsl,ventricle of the septumlucidum ; Ccl~, section ofthe genu of the corpuscallosum; Pen, com-mencement of the pinealstria or peduncle, Tfo ;Cop, posterior commissure. cornu. Like the cho-roid plexuses of the4th and 3rd ven-tricles these also arehighly vascular andtheir ventricular sur-face is beset withvillus-like proj more obvious villi are again divided upon thek surfaces and attheir borders Into small processes along which fine vessels run, andthe epithelium of the ventricles is continued over their surface. On each side of the velum interpositum, are two slight vascular fringeswhich run along its under surface, and diverging from each other behind,form the choroid plexitses of the third ventricle. The epithelium changes its character where it covers the plexuses. It is therecomposed of larg-e spheroidal corpuscles, in each of which is seen, besides adistinct nucleus, several yellowish granules, and one or more dark round oil-. THE CORPOEA STRIATA. 351 drops. According to Henle each, of these cells is provided with short acumi-nate processes. The choroid artery enters the velum interpositum at the lower end ofthe descending cornu ; and other arteries enter from behind, beneath thecorpus callosum. The greater number of the veins terminate in twoprincipal vessels named the veins of G-alen, which run backwards velum interpositum, and passing out beneath the corpus callosumpour their blood into the straight sinus, having generally first unitedinto a single trunk. The corpora striata {ganglia of the cerebral liemispheres), situated infront and to the outer side of the oj)tic thalami, are two large ovoid Fig. 306. — Trans- Fig. 306. VEKSE SECTION THROUGH THE BRAINAND SKULIi MADE WHILST FROZEN (Keyand Retzius). ^ c, c, corpus caUo-sum ; below its middlepart the septum luci-dum, and below thatagain the fomiK ; L V,lateral ventricle ; th,thalamus; between thetwo thalami the th
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