. A treatise on practical anatomy: for students of anatomy and surgery . FiG. 131.—Medulla Oblongata, Pons, Cekebellxjm, anb CburaCerebri, Seen from in Front. rior and inferior border. The borders are sharply defined,—the anterior curved from side to side, the inferiorslightly concave. The inferior surface presents a medianlongitudinal groove, in which reststhe basilar one inch on either side of the median groove isthe origin of the fifth pair of nerves—nearer the anteriorthan the inferior border. Externally the pons narrowsand enters the cerebellum, forming its middle pe- TIIK CE
. A treatise on practical anatomy: for students of anatomy and surgery . FiG. 131.—Medulla Oblongata, Pons, Cekebellxjm, anb CburaCerebri, Seen from in Front. rior and inferior border. The borders are sharply defined,—the anterior curved from side to side, the inferiorslightly concave. The inferior surface presents a medianlongitudinal groove, in which reststhe basilar one inch on either side of the median groove isthe origin of the fifth pair of nerves—nearer the anteriorthan the inferior border. Externally the pons narrowsand enters the cerebellum, forming its middle pe- TIIK CEKEBELLUM. 301 dimcles. The upper surftice of the pons forms ])art ofthe floor of the fourtli ventricle. Its fibres are dividedinto transverse and longitudinal. Of the former thereare two planes—superficial and deep. The longitudinallayers are likewise separated into two sets: the firstpasses upward between the transverse planes; the deep. Fig. 132.—The CEREBELttrM, Upper Surface. set, above the deep transverse plane, forms part of thefibres of the floor of the fourth ventricle. The cerebelliun is situated beloAv the posterior lobesof the cerebrum. It is lodged in the inferior occipitalfossae. It weighs about five and one-half to six is about four inches transversely, two and one-halfinches antero-posterioiiy, two inches vertically at thethickest part. It is composed of a gray cortex and awhite medullary portion, in which there is imbedded an 302 PRACTICAL ANATOMY. open gray capsule, called the corpus dentatum. It con-sists of two symmetrical hemispheres joined together bya central constricted commissural portion. The uppersurface is flattened, slightly convex, and presents- twolobes,—a large anterior, the quadrate, and a narrowerportion, the semilunar. Along the median line is thetransverse commissure called the superior vermiformprocess, which begins at the anterior notch and termi-nates at the posterior
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
