. Human physiology. mencommune posterius. 13. Corpora quadrigemina, upon whichis tlie pineal gland, 14. Iter a tertio ad quartum veutri-culum. 16. Fourth ventricle. 17. Pons Varolii, throughwhich are passing the diverging fibres of the corpora pyia-midalia. IS. Crus cerebri of the left side, with the thirdnerve arising from it. 19. Tuber cinereum, from which pi-o-jects the infundibulum having the pituitary gland appended the organ, and in them ful-fils a like function. Whenthe fluid accumulates to agreat extent, the resultingdisease is hydrocephaluschronicus. Henle has shownthat it is not
. Human physiology. mencommune posterius. 13. Corpora quadrigemina, upon whichis tlie pineal gland, 14. Iter a tertio ad quartum veutri-culum. 16. Fourth ventricle. 17. Pons Varolii, throughwhich are passing the diverging fibres of the corpora pyia-midalia. IS. Crus cerebri of the left side, with the thirdnerve arising from it. 19. Tuber cinereum, from which pi-o-jects the infundibulum having the pituitary gland appended the organ, and in them ful-fils a like function. Whenthe fluid accumulates to agreat extent, the resultingdisease is hydrocephaluschronicus. Henle has shownthat it is not a serous sac,like the pleura or pericar-dium. Its inner surface,according to Kcilliker,^ withits epithelium, is every-where in close contact withthe dura mater, so that acavunn arachnoidece does notexist. Anatomists usually de-scribe a third tunic of thebrain—the pia mater. Thisis generally conceived toconsist of the minute termi- te Its extremity,factory nerve. 20. One of the optic nerves. 21. Left ol- Fig. Convolutions of one Side of the Cerebrum as seen from above. 1. Anterior lobe of the cerebrum. 2. Posterior lobe. 3. Middle lobe. Mikroskopisclie Anatomie, Bd. ii. S. 491, Leipz., 1850; and Amer. edit, of Syden-ham Societys edition of his Human Histolotry, by Dr. Da Costa, p. 395, Philad., , also, .Jones and Sieveking, Manual of Patlioiogical Anatomy, x\mer. edit., p. 231,Philad., 1854. 632 SENSIBILITY. Fig. 188. nations of the cerebral arteries, and those of the corresponding veins;forming at the surface of the brain a vascular network, which passesinto the cavities; and, in the ventricles, forms the plextis choroides andtela choroidea. The dura and pia mater were so called by the olderanatomists, because they were conceived to be the origin of all theother membranes of the body. The cerebrum or hrain proper has the form of an oval, larger its outer surface are varions undulating eminences, called convolu-tions^ because they have been thought to
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