Diseases of the nervous system : a text-book of neurology and psychiatry . Fig. 83.—Optic atrophy in tabes with loss of color discrimination.(Wilbrand and Sanger.) exist. The most suggestive cause of an isolated, bilateral, progressiveoptic atrophy without other tangible neurological signs is tests wiU complete the diagnosis (Figs. 82 and 83). DISEASES OF THE OPTIC PATHWAYS 193 Disease at or about the Chiasm.—The anatomical peculiarities, dueto the crossing of the fibers at the chiasm, introduces certain definitesigns which are of value. Scotomata and concentric limitation
Diseases of the nervous system : a text-book of neurology and psychiatry . Fig. 83.—Optic atrophy in tabes with loss of color discrimination.(Wilbrand and Sanger.) exist. The most suggestive cause of an isolated, bilateral, progressiveoptic atrophy without other tangible neurological signs is tests wiU complete the diagnosis (Figs. 82 and 83). DISEASES OF THE OPTIC PATHWAYS 193 Disease at or about the Chiasm.—The anatomical peculiarities, dueto the crossing of the fibers at the chiasm, introduces certain definitesigns which are of value. Scotomata and concentric limitation arereplaced by hemianopsias of varying type. In lesions in front of the chiasm bitemporal hemianopsia will bepresent. This is rare. A lesion behind the chiasm, usually in thesella turcica, and not infrequent, as in pituitary disease, causes abinasal hemianopsia, partial or complete. Lesions to the right orleft of the chiasm will cause incomplete homonymous hemianopsias—whereas lesions in the tract back of the chiasm—i. e., in the midbrainor optic radiations or
Size: 1679px × 1488px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectmentaldisorders
