. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. MEDULLA OBLONGATA AND TEGMENTUM OF THE PONS. 387 ganglion in man^ in animals often very large, sitnated between the cere- bellnm and pons, dorso-lateral from the cochlear nuclens. This is the tuberculum acusticum. This portion also arborizes around cells. And so the primary nenron of the cochlearis terminates in these two places. From the two primary termini arises a new fiber-tract, which in its secondary and tertiary prolongation reaches eventually the lateral lemniscus, or
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. MEDULLA OBLONGATA AND TEGMENTUM OF THE PONS. 387 ganglion in man^ in animals often very large, sitnated between the cere- bellnm and pons, dorso-lateral from the cochlear nuclens. This is the tuberculum acusticum. This portion also arborizes around cells. And so the primary nenron of the cochlearis terminates in these two places. From the two primary termini arises a new fiber-tract, which in its secondary and tertiary prolongation reaches eventually the lateral lemniscus, or, rather, forms this lemniscus. 1. The cells of the nucleus ventralis send out their axis-cjdinders toward the median line, where the}^ are seen to leave the center as a strong This tract is called the corpus trapezoideum. It lies directly dorsal to the pontile fibers, and in animals, because their pons is shorter than in man, is visible free on the base of the brain (vide Fig. 246). Within the trapezoid body are scattered large cells, nucleus trapezoideus. Fig. 246.—Medulla oblongata and pons of a monkey, demonstrating the corpus trapezoideum or trapezium, ct. a, Pyramids. (Kolliker), whose axis-cylinders take the same direction as the thick trape- zoid fibers of the cochlear nucleus. The entire, rather important mass of fibers extends to a small group of ganglion-cells, the superior olivary nucleus, and as much to the same side as by decussation to the opposite side (Fig. 2-i5). And here, seemingly, the secondary auditory neuron ends. To the upper olive come the fibers of the lateral fillet, a dense arborization. In this way connection between the acusticus and the posterior, perhaps also the anterior, corpora quadrigemina is established. Degeneration changes (Bumm, Baginski) make it appear that not only the fillet-fibers descending here give off a great many collaterals around the upper olivary nucleus, but also that from this nucleus itself, from the nucleus trap
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