Diseases of the nervous system : a text-book of neurology and psychiatry . ig. 86.—Showing atrophic degenerations in optic radiations (atr.) from hemorrhagein external geniculate (Fig. 85), giving rise to quadrant hemianopsia of Fig. 84. Cun.,cuneus; Calc, calcarine fissure; , inferior longitudinal fasciculus; I, left hemisphere;atr., atrophy. (Henschen.) Optic hallucinations are present in disorder of the optical endstations in the occipital lobe. When they show definite projectionsin space one can make an accurate localization of the portion of thelobe involved. This may be of great va
Diseases of the nervous system : a text-book of neurology and psychiatry . ig. 86.—Showing atrophic degenerations in optic radiations (atr.) from hemorrhagein external geniculate (Fig. 85), giving rise to quadrant hemianopsia of Fig. 84. Cun.,cuneus; Calc, calcarine fissure; , inferior longitudinal fasciculus; I, left hemisphere;atr., atrophy. (Henschen.) Optic hallucinations are present in disorder of the optical endstations in the occipital lobe. When they show definite projectionsin space one can make an accurate localization of the portion of thelobe involved. This may be of great value in determining the siteof a tumor or abscess formation. The chief arterial supply of the posterior neurones is drawn fromthe calcarine branch of the posterior cerebral. The most occipitalportion is supplied by the median cerebral. The anterior cerebralsends branches which innervate the optic radiations just posteriorto the corpus callosum, but lesions of this artery at this place cause nodefinitely recognizable lesions. 196 SENSORI-MOTOR NEUROLOGY—CRANIAL NERVES. lit S g ca oj ^•^ |--Sg o 8 8 DISEASES OF THE OCULOMOTOR NERVES 197 The cortical disturbances of vision from lesions of the temporalor occi})ital lol)es cannot be entered into more fully here. See chapterson Aphasia, Syphilis of the Brahi (Paresis), Brain Tumor, Hemiplegia,Thrombosis, Arteriosclerosis, etc.^ DISEASES OF THE OCULOMOTOR NERVES. Ocular Nerves: Third, Fourth, Sixth.—Disorders of the functionsof these nerves are best discussed under a general head, since the usualocular palsies are often complex syndromes in which one or more ofthese nerves are involved. The third nerve is a motor nerve for all of the muscles of the eye-ball, save the external rectus, and the superior oblique, which latterreceive their motor fibers from the sixth and fourth nerves third nerve also supplies the levator palpebrse, the ciliary muscleand the contracting fibers of the pupil. The dilating fibers of th
Size: 1220px × 2047px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectmentaldisorders
