. Text-book of normal histology: including an account of the development of the tissues and of the organs. s pass from the inferior olivary body of the oppositeside to the cerebellum by way of the restiform body. A third setof arcuate fibres, the posterior external, passes from the posteriorfuniculi of the same side to the cerebellum by way of the restiformbody. In addition to the longitudinal fibres contributed by the deeparcuate bundles, the continuation of tracts from the anterolateralcolumn furnish longitudinal fibres of the formatio reticularis. In theupper part of the medulla, a group of
. Text-book of normal histology: including an account of the development of the tissues and of the organs. s pass from the inferior olivary body of the oppositeside to the cerebellum by way of the restiform body. A third setof arcuate fibres, the posterior external, passes from the posteriorfuniculi of the same side to the cerebellum by way of the restiformbody. In addition to the longitudinal fibres contributed by the deeparcuate bundles, the continuation of tracts from the anterolateralcolumn furnish longitudinal fibres of the formatio reticularis. In theupper part of the medulla, a group of longitudinal fibres constitutea distinct tract, the posterior longitudinal bundle. THE CENTRAL NERVOUS SYSTEM. 299 On reaching the inferior 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 sheetof gray matter so disposed that it forms collectively a compressedovoid capsule or shell, closed externally, but open towards themedian side, through which hilum the nerve-fibres gain access to Fig. Section of medulla of child through olivary bodies: a, anterior median groove; b, raph^; c,_formatio reticularis; «£, gray matter of nucleus dentatus of olive ; ^, dorsal accessory olivary body;y, 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 ; 711, n, 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. The considerable tract of nerve-fibres entering thehilum constitute the olivary peduncle, having crossed the raphefrom the olive of the opposite side. After gaining the interior ofthe oliv
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