. A treatise on nervous and mental diseases, for students and practitioners of medicine. )laining the clinical pecu-liarity that hemorrhage into this region of the internal capsule is ANATOMY. 39 almost always productive of motor paralysis of the hemiplegic type,and that the sensory paralysis is usually slight or absent. Outside of the lenticular nucleus (Fig. 20) is seen a strip of whitematter, which is known as the external capsule, in the centre ofwhich is a narrow streak of gray matter, the claustrum. Externalto the external capsule are those inturned convolutions lying buriedin the fissur
. A treatise on nervous and mental diseases, for students and practitioners of medicine. )laining the clinical pecu-liarity that hemorrhage into this region of the internal capsule is ANATOMY. 39 almost always productive of motor paralysis of the hemiplegic type,and that the sensory paralysis is usually slight or absent. Outside of the lenticular nucleus (Fig. 20) is seen a strip of whitematter, which is known as the external capsule, in the centre ofwhich is a narrow streak of gray matter, the claustrum. Externalto the external capsule are those inturned convolutions lying buriedin the fissure of Sylvius, and known as the island of Reil, The leftside of Fig. 20 will make it clear how it is that the island of Reilcomes in at this point. From the internal capsule the fibres pass ondown into the crura cerehn, which can be seen at the base of the Fig. 21. OPTIC NERVC OPTIC CHIASM. 9-N£RV£lO-NCRVC. Drawing showing pulvinar, optic nerve, optic chiasm, optic tract, pons, dorsal sur-face of medulla and upper portion of cord, base of cerebellum, and superficial originsof the second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, andtwelfth cranial nerves. brain by going back to Fig. 5, where it will also be observed thattheir fanciful name of the legs of the brain, given them by the earlyanatomists, was not so badly chosen. The crura cerebri, however,are more distinctly shown in Fig. 21, and this figure shows theirrelation to the optic chiasm and the surrounding under-lobes ofthe cerebrum. Through the crura cerebri the nerve fibres pass onthrough the pons Varolii, or the bridge of Varolius, which is thename given to the mass of fibres passing over from one lobe of thecerebellum to the other. Fig. 22 shows the transverse fibres cutin the centre so that one-half of the right side is lifted, in order tomake clear the course of the long or longi
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