Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . would affect only those fibres of tlie optic chiasm or optic tractwhich supply the temporal half of each retina, and at the same timeleave the decussating fibres intact. How, then, are we to account forthe fact that this form is sometimes met with ? I would call attentionto a peculiar arrangement of the arteries in tlie region of the opticchiasm as a factor in causing this condition. It has been shown thatatheromatous degeuera
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . would affect only those fibres of tlie optic chiasm or optic tractwhich supply the temporal half of each retina, and at the same timeleave the decussating fibres intact. How, then, are we to account forthe fact that this form is sometimes met with ? I would call attentionto a peculiar arrangement of the arteries in tlie region of the opticchiasm as a factor in causing this condition. It has been shown thatatheromatous degeueration of the circle of Willis (a peculiar arrange- HEMIANOPSIA. 59 meiit of blood-vessels at the base of the brain) so impairs the elasticityof the arteries as to create through their pulsation a type of injury tothe chiasm, so limited in its extent as to impair only the fibres dis-tributed to the temporal halves of the retinae, and thus to create bi-temporal hemianopsia. Hemianopsia will be more fully discussed in connection with theeffects of lesions of the optic nerve. The diagrams introduced will, Itrust, make the facts stated clear to the mind of the v_-(_^^i^ \ MEDULLA
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Keywords: ., bookcentury1800, bookdecade1880, bookidlecturesonne, bookyear1888
