A manual of anatomy . ear the pontile border of the lateral marginof each crus is the trochlear nerve. Upon each side of the midbrain are seen the crus, the medialgeniculate body, and the superior and inferior brachia. The internal geniculate body (corpus geniculatum mediale) is asmall oval eminence on the side of the midbrain. It is connectedwith its fellow of the opposite side by the commissure of also represents an intermediate nucleus in the auditory pathway. The superior brachium (brachium quadrigeminum superius) is a 38o THE NERVE SYSTEM band of fibers at the upper, medial part
A manual of anatomy . ear the pontile border of the lateral marginof each crus is the trochlear nerve. Upon each side of the midbrain are seen the crus, the medialgeniculate body, and the superior and inferior brachia. The internal geniculate body (corpus geniculatum mediale) is asmall oval eminence on the side of the midbrain. It is connectedwith its fellow of the opposite side by the commissure of also represents an intermediate nucleus in the auditory pathway. The superior brachium (brachium quadrigeminum superius) is a 38o THE NERVE SYSTEM band of fibers at the upper, medial part of the midbrain. It consistsof fibers of the optic tract that terminate in the superior quad-rigem-inal body and also of fibers that pass to the lateral geniculate inferior brachium {brackium quadrigeminum inferius) lies atthe side of the upper quadrigeminal body and disappears under themedial geniculate body. It represents fibers of the auditory path-way from the inferior quadrigeminal body. mammitlary body. aeoastic nervefacial nerve \ ^ elossopharyngeaf nervevagus nerve pyramid spindt cord Fig. 270.—Brain stem, ventral view. accessory nervemedulla oblongataCassation of the pyramids (Sobolla and McMurrich.) The dorsal surface of the midbrain exhibits the corpora quadrigemina,or coUiculi; of these there axe four, two superior and two inferior, andthey are separated from one another by a transverse and a longi-tudinal furrow. The latter is in the midline. The superior quadrigemina are oval in shape, yellowish gray incolor and are the larger. Above, in the median groove that sepa-rates them, lies the pineal body. They are centers connected witheye-muscle reflexes, resulting from optic and auditory impulses. The inferior quadrigemina are nearly hemispherical in shape andlighter in color than the preceding. They are nuclei in the pathwayof auditory impulses. THE CEREBELLUM 381 The superior and inferior quadrigemina rest upon the lammaquadrigefnina which really constitu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
