Diseases of the nervous system .. . Radix posteric • Ascending and de-scending branch ofthe sensory rootfibers >Sensory collaterals Iract cell and tractfiber Fig. 86.—Diagram of the Motor and Sensory Conduction Tracts (Reflex Arcs). (After Toldt.) tracts the lemniscus tract passes upward. The nuclei of the acoustic nervehave been described (Figs. 88, 89. 94. 95). The ventral nucleus, situatedventrally and lateral!} near the entrance of the nerve, contains some of thesecond neuron cells. These fibers pass horizontally and medially through thepons between the pyramidal and lemniscus tracts, a
Diseases of the nervous system .. . Radix posteric • Ascending and de-scending branch ofthe sensory rootfibers >Sensory collaterals Iract cell and tractfiber Fig. 86.—Diagram of the Motor and Sensory Conduction Tracts (Reflex Arcs). (After Toldt.) tracts the lemniscus tract passes upward. The nuclei of the acoustic nervehave been described (Figs. 88, 89. 94. 95). The ventral nucleus, situatedventrally and lateral!} near the entrance of the nerve, contains some of thesecond neuron cells. These fibers pass horizontally and medially through thepons between the pyramidal and lemniscus tracts, and cross to the otherside. This tract is called the corpus trapezoideum (Figs. 88, 89,).Large numbers of nerve-cells are here deposited. Directly above them dor-sally and immediately below the nucleus of the facial nerve is a small col-lection of ganglia, the upper olive, into which large numbers of these fiberspenetrate. Many fibers of the corpus trapezoideum appear to split up around theirown cells as well as around the c
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