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       (PATH "gifs/Syllabus Chapters/Visual/path.compoF.gif"))
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(FRAME-INFO (STRING "Pituitary Adenoma \(upper left\); Calcarine Infarct \(lower left\). \(Images compliments of Drs. E. C. Alvord, Jr., and  A.M. Spence, Dept. of Pathology, University of Washington\). The approximate plane of section is shown on the brain at the right. Upper left: you are looking at a frontal section passing through the anterior commissure and rostral temporal lobe. The internal carotid arteries are present. The middle cerebral arteries are present in the lateral fissure on each side. The tumor \(a pituitary adenoma\) has pressed into the optic chiasm destroying the crossing fibers; these fibers normally carry information from each of the nasal retinas \(temporal visual fields\). This lesion resulted in a scotoma called a bitemporal hemianopia. Lower left: A frontal view of a small slab of right occipital cortex is shown. The dark area in the calcarine sulcus medially \(and in the subarachnoid space on the surface of the brain laterally\) is blood. If the entire calcarine cortex \(upper and lower banks of the calcarine sulcus\) of one hemisphere is destroyed, a visual defect called contralateral homonymous hemianopia results; in this case it would be a left homonymous hemianopia. "))
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