Human anatomy, including structure and development and practical considerations . ,^ Section of inferior olivary nucleus, showinj; plicated sheet of gray substancetraversed by strands of cerebello-olivary fibres. X loo. THE MEDULLA OBLONGATA. 1073 which the lower and middle are continuous and the upper is unconnected, and foursmall isolated masses of j^ray matter alonj^ the dorsal border of the nucleus. Theinferior or spinal end of the nucleus is thickened and bent outward, so that its planeis oblique and parallel with the ventral surface of the chief olive. Higher, when thelatter is well esta
Human anatomy, including structure and development and practical considerations . ,^ Section of inferior olivary nucleus, showinj; plicated sheet of gray substancetraversed by strands of cerebello-olivary fibres. X loo. THE MEDULLA OBLONGATA. 1073 which the lower and middle are continuous and the upper is unconnected, and foursmall isolated masses of j^ray matter alonj^ the dorsal border of the nucleus. Theinferior or spinal end of the nucleus is thickened and bent outward, so that its planeis oblique and parallel with the ventral surface of the chief olive. Higher, when thelatter is well established, the mesial accessory nucleus is represented by a narrowbroken tract, that corresjx)nds more closely with the sagittal plane. In this situa-tion the nucleus lies between the fillet and the inner end of the chief olive antl across Dorsal nucleus of vagus Fig. 927. Ventricular roof Funiculus cunea- tus, overlaid by restiform body Substantia geKitinosaoverlaby root of \ Nucleus ambiguuB. Nucleus cuneatus .poglossal 4L, Post, longitudinal* ^J/ fasciculus Nucleus lateralis- Root-fibres of XII Interior olivarynucleus Tract of mesial fillet Pyramidal tract Anterior superficial arcuate fibres Transverse section of medulla at level E, Fig. 919 ; central canal has opened into fourth ventricle ; restiformbody appearing. X 5. Preparation by Professor Spiller. its hilum. The dorsal accessory olivary nucleus (nucleus olivaris accessorius dorsalis)is less extensive than the median, measuring about 9 mm. in length, and lies close toand behind the posterior lip of the hilum of the inferior olive. The Central Gray Matter.—As pointed out, within the closed part of themedulla the central canal and the surrounding gray matter are gradually displaceddorsally in consequence of the increasing space required by the pyramid, the fillettract and the posterior longitudinal fasciculus, three paired tracts of longitudinallycoursing fibres that lie close to the median raphe and enlarge as they
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
