Nervous and mental diseases . Crossed fibers.;*. Uncrossed fibers of papillo-rnacular bundle. Fig. 29 A.—Diagram of the optic chiasm, from Wilbrand and Sanger (after Henschen). fibrous septa. These are quite uniform anatomical structures, as shownby Wilbrand and Sanger. The optic tract passing backward encircles the crus cerebri andenters the geniculate bodies, the anterior corpus quadrigeminum, and1 K Y. Med. Jour., Feb. 4, 1905. DISEASES OF THE FIRST AND SECOND CRANIAL NERVES. 103 the optic thalamus of the same side. From these ganglionic bodiesfibers then pass outward and b
Nervous and mental diseases . Crossed fibers.;*. Uncrossed fibers of papillo-rnacular bundle. Fig. 29 A.—Diagram of the optic chiasm, from Wilbrand and Sanger (after Henschen). fibrous septa. These are quite uniform anatomical structures, as shownby Wilbrand and Sanger. The optic tract passing backward encircles the crus cerebri andenters the geniculate bodies, the anterior corpus quadrigeminum, and1 K Y. Med. Jour., Feb. 4, 1905. DISEASES OF THE FIRST AND SECOND CRANIAL NERVES. 103 the optic thalamus of the same side. From these ganglionic bodiesfibers then pass outward and backward around the posterior horn ofthe lateral ventricle, to end in the cortex of the cuneus, the postero-internal portion of the occipital lobe. This portion of the occipital loberepresents, therefore, half-vision for each eye and is in relation with the. Left. Right, Fig. 30.—Blindness in both temporal fields in a case of acromegalia due to injury of the chiasm bypituitary enlargement. The nasal fields are also contracted. lateral halves of the retinas on the same side of each eyeball. Anylesion that interrupts the visual pathway back of the chiasm, or destroysthe visual centers in the cuneus, produces lateral homonymous hemi-anopsia.
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