Nervous and mental diseases . 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. 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. 31. -Homonymous lateral hem
Nervous and mental diseases . 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. 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. 31. -Homonymous lateral hemianopsia from an injury to the right occipital apex. The rightlateral fields also contracted. lateral halves of the retina? 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. 100 DISEASES OF THE CRANIAL NERVES. The cortical half-vision centers of the cuneus are in turn brought byconnecting fibers into relation with higher centers for visual memories,probably situated in and about the angular gyri of the parietal these higher visual centers both eyes are represented in each hemi-sphere. The parietal centers probably freely communicate through thecallosal crossway. Injury to the left parietal region in right-handedpersons produces loss of visual word-memories; or word-blindness, butdoes not necessarily cause hemianopsia. The fibers which supply the macula lutea of the retina occupy at theapex of the o
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