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 more obvious villi are again divided upon their 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 more obvious villi are again divided upon their 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 plexuses of the third ventricle. The epithelium changes its character where it covers the plexuses. It is therecomposed of large spheioidal corpuscles, in each of which is seen, besides adistinct nucleus, several yellowish granules, and one or more dark round oil-. THE CORPORA 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 Galen, which run backwards onthe 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 hemispheres), situated infront and to the outer side of the optic thalami, are two large ovoid Fig. 306. — Trans- Fig. 306. VEKSE SECTION THROUGH THE BRAINAND SKULL MADE WHILST FROZEN (Keyand Retzius). J c, c, corpus callo-sum ; below its middlepart the septum luci-dum, and below thatagain the fornix ; L V,lateral ventricle ; th,thalamus; between thetwo thalami the thirdven
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