Human anatomy, including structure and development and practical considerations . e,to join the restiform body, within which it continues its jtjurney to the anterior superficial arcuate fibres also enter the restiform body, after sweepingaround the inferior pole of the olive, or crossing its surface, and the upper part of thefuniculus of Rolando. Additional contributions, the posterior supcrjicia/ arcuateJibres, proceed to the restiform body from the gracile and cuneate nuclei of thesame side. Just before bending backward to enter the cerebellum, the restiformbody is crossed by
Human anatomy, including structure and development and practical considerations . e,to join the restiform body, within which it continues its jtjurney to the anterior superficial arcuate fibres also enter the restiform body, after sweepingaround the inferior pole of the olive, or crossing its surface, and the upper part of thefuniculus of Rolando. Additional contributions, the posterior supcrjicia/ arcuateJibres, proceed to the restiform body from the gracile and cuneate nuclei of thesame side. Just before bending backward to enter the cerebellum, the restiformbody is crossed by a variable number of superficial strands, the striae acusticae,that may be traced from the floor of the fourth ventricle and around the inferiorpeduncle to the cochlear nucleus. INTERNAL STRICTURE OF THE MEDULLA OBLONGATA. As already j^ointed out, the correspondence between the si)inal cord and themedulla is only superficial, sections across the medulla re\ealing the presence of con-siderable masses of gray matter and important tracts of nerxe-fibres not represented Fio. FlK. 92VFig. 927Fig. 924 Fig. 922- Fig. 921Fig. 92cr Ventral iA) and dorsal {B) aspects of brain stem, showing levels of sections which follow. in the cord, as well as the rearrangement, modification or disappearance of spinaltracts which are prolonged into the bulb. In consequence, the medulla, even atits lower end, presents new features, and towards its upper limit varies so greatlyfrom the cord that but slight resemblance to the latter is retained. The character-istic features displayed by transverse sections of the medulla at dillerent levelsdepend upon the changes induced by four chief factors :—(i) the decussation ofthe pyramids, {2) the appearance of the dorsal nuclei, (3) the production of theformatio reticularis, and (4) the opening out of the fourth ventricle. Till: 1069 Iu;. q2. Ilniiculus Kiacilis Iuiiiculusiiiieatus Siibstaiilia ^claliiiona . of iiustcrioicoriiu
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
