Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 THE BKAIN 639 margin of the pons by two roots, one of which, the dorsal root, winds round the restiform body, while the other, the ventral or median root, sinks into the substance of the bulb to the inner side of the restiform body. The fibres composing the dorsal roots come from the cochlea and convey sensations of sound. The fibres bifurcate, the ascending branches ending in the dorsal nucleus (acoustic tubercle), while the descending make connection vvith a mass of cells in the angle between
Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 THE BKAIN 639 margin of the pons by two roots, one of which, the dorsal root, winds round the restiform body, while the other, the ventral or median root, sinks into the substance of the bulb to the inner side of the restiform body. The fibres composing the dorsal roots come from the cochlea and convey sensations of sound. The fibres bifurcate, the ascending branches ending in the dorsal nucleus (acoustic tubercle), while the descending make connection vvith a mass of cells in the angle between the two roots, known as the accessory nucleus. The ventral root consists of fibres derived from the vestibule and semicircular canals, and carries impulses connected with the reflex main- tenance of equilibrium. It ends partly in the lateral auditory Fig. 295. Cbni Section through medulla just behind the pons?, to show origin of anditoiy neive. Cbm. Cerebellum. V. Fourth ventricle. E. Resti- form body. Py. Pyramid. Va. Ascending root of fifth nerve. VII. Nucleus of seventh nerve. VIII. Auditory nerve. nucleus (of Deiters), whence a number of fibres pass up with the restiform body into the cerebellum, and partly in the median nucleus. The ninth, tenth, and eleventh nerves are connected with an elongated nucleus in the lateral part of the lower half of the fourth ventricle, the motor fibres of the first two nerves arising from the nucleus ambiguus. The ninth is probably a pure sensory nerve, and conveys sensations from tongue (taste?) and pharynx. Eunning in it are also motor fibres to the stylo-pharyngeus and middle constrictor of the pharynx. The tenth or vagus is joined by the accessory part of the spinal accessory, so that the two nerves may be considered
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