. Cunningham's Text-book of anatomy. Anatomy. 606 THE NERVOUS SYSTEM. which pass directly to the mid-brain (fasciculus vestibulomesencephalicus), chiefly to the oculomotor and trochlear nuclei (Eig. 524, p. 590). Central Connexions of the Cochlear Nerve.—The cochlear nuclei are brought iuto connexion with the inferior colliculus and the medial geniculate body of the opposite side by the fibres of the corpus trapezoideurn and the lateral lemniscus. The fibres of the cochlear nerve end in the ventral cochlear nucleus and in the dorsal cochlear nucleus (tuberculum acusticum). From the cells of th
. Cunningham's Text-book of anatomy. Anatomy. 606 THE NERVOUS SYSTEM. which pass directly to the mid-brain (fasciculus vestibulomesencephalicus), chiefly to the oculomotor and trochlear nuclei (Eig. 524, p. 590). Central Connexions of the Cochlear Nerve.—The cochlear nuclei are brought iuto connexion with the inferior colliculus and the medial geniculate body of the opposite side by the fibres of the corpus trapezoideurn and the lateral lemniscus. The fibres of the cochlear nerve end in the ventral cochlear nucleus and in the dorsal cochlear nucleus (tuberculum acusticum). From the cells of these nuclei two tracts arise, viz., a ventral tract, composed of the fibres of the corpus trapezoideurn, and a dorsal tract, which is represented by the stria? medullares. The corpus trapezoideurn (Figs. 531 and 532) is formed of the axons of the cells of the ventral cochlear nucleus, as well as certain of the axons of the cells of the dorsal nucleus. In the midst of the corpus trapezoideurn are lodged large cells which are known as the nucleus trapezoideus, and these give off axons which join the strand with which they are associated. Many of the fibres of the corpus trapezoideurn end in a large mass of gray matter called the nucleus olivaris superior, which is placed immediately behind the. Fig. 536.—Section through the Pons of the Orang. The left side of the drawing is taken from a section at from which the right side A 1. Ascending part of facial nerve. 2. Medial longitudinal bundle. 3. Descending root of vestibular nerve. 4. Radicular fibres of facial nerve. 5. Restiform body. 6. Facial nucleus. 7. Spinal tract of trigeminal nerve 8. Vestibular nerve. 9. Superior olive. 10. Lemniscus medialis. 11. Pyramidal tract. 12. Transverse fibres of pons. a level slightly inferior to the section is taken. B 1. Ascending part of facial nerve. 2. Emergent portion of facial nerve. 3. Restiform body. 4. Nucleus of abducens nerve. 5. Abducens nerve. 6. Emergent part of facial nerve. 7.
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