. Cunningham's Text-book of anatomy. Anatomy. INTERNAL STRUCTURE OF MEDULLA OBLONGATA AND PONS. 559 as it is traced upwards, is observed to cling closely to its original relationship with the fasciculus anterior proprius. It is applied to the lateral side of this strand, and, gradually becoming smaller, finally disappears at the level of the inferior part of the inferior olivary nucleus. Cuneate and Gracile Fasciculi, with their Nuclei.—As the fasciculus gracilis and the fasciculus cuneatus of the posterior funiculus of the spinal medulla are traced up into the medulla oblongata they seem to i
. Cunningham's Text-book of anatomy. Anatomy. INTERNAL STRUCTURE OF MEDULLA OBLONGATA AND PONS. 559 as it is traced upwards, is observed to cling closely to its original relationship with the fasciculus anterior proprius. It is applied to the lateral side of this strand, and, gradually becoming smaller, finally disappears at the level of the inferior part of the inferior olivary nucleus. Cuneate and Gracile Fasciculi, with their Nuclei.—As the fasciculus gracilis and the fasciculus cuneatus of the posterior funiculus of the spinal medulla are traced up into the medulla oblongata they seem to increase in bulk, and in trans- verse sections they assume the form of massive wedge-shaped strands, quite distinct from each other. They increase in width and lose considerably in depth, and consequently the transverse diameter of the area which they occupy becomes greater. As a result of this, and also owing to the removal of the lateral cerebro-spinal tract from the lateral funiculus of the spinal medulla immediately in front, the posterior column of gray matter is gradually rotated forwards and comes to lie transversely and in the same straight line with its fellow of the Funiculus gracilis Gracile nucleus niculus cuneatus Cuneate nucleus Central canal Internal arcuate hi fibres /fTiSsS Accessory cuneate nucleus Tractus spinalis of fifth nerve Nucleus tractus spinalis nervi trigeniini Fasciculus anterior CTffc proprius \T~^T Decussation of lemniscus medialis Inferior olivary nucleus. Fasciculus anterior proprius Medial olivary nucleus Pyramid 1/ Arcuate nucleus covered superficially by external arcuate fibres Fig. 491.—Section through the Closed Part of the Human Medulla Oblongata immediately above the Decussation of the Pyramids (Weigert-Pal specimen). opposite side (Figs. 490 and 491). The substantia gelatinosa, at the same time, becomes increased in quantity and presents a horseshoe-shaped outline in trans- verse section. It clasps within its concavity the somewhat re
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