. The anatomy of the domestic animals. Veterinary anatomy. 794 NERVOUS SYSTEM OF THE HORSE pai't of the thalamus, and (3) the ajiterior quadrigeminal body (indirectly). The fibers which go to the medial geniculate body appear to belong to Gudden's commissure and to be non-visual in function. The \dsual fibers, which come from the lateral part of the retina of the same side and the medial part of the retina of the opposite side, terminate about cells in the anterior quad- rigeminal body and the part of the thalamus which corresponds to the pulvinar and lateral genicu- late body of man. From the
. The anatomy of the domestic animals. Veterinary anatomy. 794 NERVOUS SYSTEM OF THE HORSE pai't of the thalamus, and (3) the ajiterior quadrigeminal body (indirectly). The fibers which go to the medial geniculate body appear to belong to Gudden's commissure and to be non-visual in function. The \dsual fibers, which come from the lateral part of the retina of the same side and the medial part of the retina of the opposite side, terminate about cells in the anterior quad- rigeminal body and the part of the thalamus which corresponds to the pulvinar and lateral genicu- late body of man. From the cells of the former fibers pass to the nuclei of the motor nerves of the eyeball, and complete the reflex arc. Fibers proceed from the cells of the thalamus to the visual area of the cortex in the occipital part of the hemisphere. THE OCULOMOTOR NERVE The oculomotor nerve (N. oculomotorius) arises by several radicles from the basal surface of the corcliral iieduncle, a little lateral to the interpeduncular furrow. It turns sharply outward and for- ward, crosses over the cavernous sinus, and continues above the maxillary nerve and in company with the ophthalmic nerve to the foramen orbitale. It emerges through the foramen with the lat- ter nerve and the abducens and divides into two branches. The dorsal branch is short and divides into two twigs which supply the rectus dorsalis and levator pal- pebrse superioris. The ventral branch (Figs. 563, 564) is larger and much longer. It supplies the motor fibers to the ciliary gan- glion (which lies directly on this branch in the horse) and short branches to the rectus medialis and rectus ventralis, and con- tinues forward on the latter to end in the ventral oblique mus- cle. The deep origin of the fibers of the oculomotor nerve is in the oculo- motor nucleus, situated in the gray mat^ ter of the floor of the cerebral aque- duct in the region of the anterior cor- pora Cranial Cavity of Horse. nerves are shown on the left
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialondon
