. Cunningham's Text-book of anatomy. Anatomy. INTERNAL STRUCTURE OF MEDULLA OBLONGATA AND PONS. 557 T/ENIA VENTRICULI QUART! olivary nucleus of that side or sweep round it. Ultimately, on the dorsal aspect of the olivary nucleus, they are gathered together in the form of a conspicuous group of arcuate fibres, which curve backwards to take up a position in the deep part of the restiform body. In passing back, they traverse the tractus spinalis of the trigeminal nerve and break it up into several separate bundles. The cerebello-olivary fibres thus connect the inferior olivary nucleus of one side
. Cunningham's Text-book of anatomy. Anatomy. INTERNAL STRUCTURE OF MEDULLA OBLONGATA AND PONS. 557 T/ENIA VENTRICULI QUART! olivary nucleus of that side or sweep round it. Ultimately, on the dorsal aspect of the olivary nucleus, they are gathered together in the form of a conspicuous group of arcuate fibres, which curve backwards to take up a position in the deep part of the restiform body. In passing back, they traverse the tractus spinalis of the trigeminal nerve and break it up into several separate bundles. The cerebello-olivary fibres thus connect the inferior olivary nucleus of one side with the opposite side of the cerebellum. Each part of the inferior olivary nucleus is connected with a definite part of the cerebellum. Decussation of the Pyramids and the Changes produced thereby.—As we examine, under the microscope, a series of successive transverse sections through the inferior end of the medulla oblongata and the upper end of the spinal medulla, the most striking change which meets the eye is the decussation of the lateral cerebro- spinal tracts. From their position alongside the anterior median fissure of the medulla oblongata most of the fibres of the pyramid cross the median plane and, after passing right through the anterior column of gray mat- ter, bend downwards in the lateral funic- ulus of the oppo- site side of the spinal medulla. Strands from the right lateral cerebro-spinal tract alternate with cor- responding strands from the left side, and the interval be- tween the bottom of the anterior median furrow and the gray matter surrounding the central canal be- comes filled up with a great mass of inter- crossing bundles of XII. [HYPOGLOSSAL] Fig. 488. -Diagram of the Fasciculus Olivocerebellars (Cerebello- Olivary Fibres). (This diagram has been constructed from the specimen figured on p. 555.) , Vagoglossopharyngeal nucleus. , Hypoglossal nucleus. As a rule the medial three-fourths of the pyramid are composed of fibres which,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
