Textbook of normal histology: including an account of the development of the tissues and of the organs . to the side. The median raphe, in addition, contains fibres extending dorso-ventrally, which emerge at the anterior median fissure to becomecontinuous with the superficial arcuate fibres, encircling with THE CENTRAL NERVOUS SYSTEM. 299 their loops the anterior pyramids and the olivary bodies. Thenerve-cells are not uniformly distributed within the gray matterof the reticulum, since in the ventral portion of the medullathe cells are very sparingly distributed, or even wanting, whilein the la
Textbook of normal histology: including an account of the development of the tissues and of the organs . to the side. The median raphe, in addition, contains fibres extending dorso-ventrally, which emerge at the anterior median fissure to becomecontinuous with the superficial arcuate fibres, encircling with THE CENTRAL NERVOUS SYSTEM. 299 their loops the anterior pyramids and the olivary bodies. Thenerve-cells are not uniformly distributed within the gray matterof the reticulum, since in the ventral portion of the medullathe cells are very sparingly distributed, or even wanting, whilein the lateral area, where the remains of the anterior cornu arefound, the nerve-cells are numerous and of large size. On reaching the level of the olivary bodies, new groups of ele-ments are introduced ; of these the most important is the nucleusof the olive, or corpus dentatum. This consists of a wavy bandof gray matter so disposed that it forms collectively a compressedovoid capsule or shell, closed externally, but open towards themedian side, through which hilus the nerve-fibres gain access to Fig. Section of medulla of child through olivary bodies: a, anterior median groove; b, raphe; cformatio reticularis ; d, gray matter of nucleus dentatus of olive ; e, dorsal accessory olivary body;f, root-fibres of hypoglossal nerve ; g, nucleus arciformis ; h, external arcuate fibres ; i, anteriorpyramidal tract; k, remains of nucleus lateralis ; /, substantia gelatinosa of Rolando and fibres ofascending trifacial root ; m, «, gray matter of posterior funiculus ; o, funiculus solitarius ; p, nucleusambiguus ; g, root-fibres of pneumogastric nerve ; r, s, hypoglossal and vagus nuclei ; t, nerve-cellsof posterior funiculus ; u, posterior medullary velum closing in fourth ventricle, IV. the interior of the nucleus. The wavy zone of gray matter iscomposed of neuroglia, in which lie numerous small multipolarganglion-cells. Two additional small areas of gray substance are seen in ^00 NORMAL
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