. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. BRAIN. 145 fibre tracts soon to be mentioned, some with nerves arising from this region. Most noticeable of these ganglia are the olivary bodies (oliva) near the roots of the hypoglossal or first spinal nerves; the nuclei of the cuneate and slender funiculi connected with the posterior columns of the cord; the eminentia medialis in the floor of the fourth ventricle, connected with the anterior and lateral columns; and the tuber acusticum, an enlargement connected with the eighth nerve; its anterior end in the i
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. BRAIN. 145 fibre tracts soon to be mentioned, some with nerves arising from this region. Most noticeable of these ganglia are the olivary bodies (oliva) near the roots of the hypoglossal or first spinal nerves; the nuclei of the cuneate and slender funiculi connected with the posterior columns of the cord; the eminentia medialis in the floor of the fourth ventricle, connected with the anterior and lateral columns; and the tuber acusticum, an enlargement connected with the eighth nerve; its anterior end in the ichthyopsida is specialized as the lobe of the lateral line system. The cerebellum is developed from the dorsal zones and the roof plate, the latter invaded by nerve cells from the sides. In front it dips deeply into the fourth ventricle, its anterior portion being vertical and together with part of the roof of the isthmus, forming the valve of cb. FIG. 150.—Diagrammatic longitudinal section of brain, ac, anterior commissure in lamina terminals; aq, aqueduct; c, cerebrum; cb, cerebellum; cp, chorioid plexus; cs, corpus striatum; cv, (cerebellal>ventricle; h, hypophysis; he, habenular commissure; ip, inferior chorioid plexus; »i, mesencephalon; ml, myelencephalon; p, pinealis; pa, paraphysis; pc, -posterior commissure; pe, parietal eye; v, valve of Vieussens; i't, velum transversum with aberrant commissure. Vieussens (velum medullare anterius,fig. 150). In the ichthyopsida and lowrer reptiles there is no special differentiation of parts in the cere- bellum, but in the higher reptiles and in the birds a central portion, the vermis, and a pair of lateral lobes, the flocculi (fig. 161) occur. In the mammals the cerebellum is still farther enlarged, chiefly by the develop- ment of large cerebellar hemispheres between vermis and flocculi, the latter being forced by them to the lower side of the cerebellum. In the walls of each hemisphere, besides others, there is a large nerve c
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