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 . and with distinctness,and notice upon which side of the fixed object the patient cannot perceivethe moving object. It is self-evident that the retina is blind upon theside opposite to that upon which the moving object is lost to sight. The most common form of hemianopsia is that in which the nasalhalf of one eye and the temporal half of the other is blind. This condi-tion is termed homonymous hemianopsia. It is the result of p
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 . and with distinctness,and notice upon which side of the fixed object the patient cannot perceivethe moving object. It is self-evident that the retina is blind upon theside opposite to that upon which the moving object is lost to sight. The most common form of hemianopsia is that in which the nasalhalf of one eye and the temporal half of the other is blind. This condi-tion is termed homonymous hemianopsia. It is the result of pressureupon, or actual destruction of one of the optic tracts, the pulvinar ofthe thalamus, the cortex of the occipital lobe (probably the cuneus), orthe fibres that connect it with the optic tract. (This seems to be provenby the late researches of Munk, Wernicke, Starr, Seguin, and others.) HEMIANOPSIA. 57 c ? a ? d b. Cortical visualarea of rightcerebral hemi-sphere. Fig 21 —A Diagram by the Author Explicative of Hemianopsia. The mes (-4 and51 indicate the fibres associated with the left cerebral hemisphere. Those of the righthemisphere (C and V) appear as separate lines. Both will be seen ni the diagranr top^sTrom the retina through the following parts: The optic nerves; the crossmg fibresthrough the optic chiasm; the optic tracts ; the external geniculate body ; the £?^P^J,^ 3^^-rigenfina or the pulvinar of the optic thalamus ; and the internal capsule. The fibres areshown to end in the cortex of the occipital lobes. , , .,, , „ „„,,c A lesion situated at the points designated as 1 2 3, 4, and 5, will ^^f^.»^°;^>;?°^hemianopsia. Lesions of the rig-hi hemisphere of the cerebrum produce blindness of theright halfai each eye, and vice vey:a 58 LECTURES ON NERVOUS DISEASES. Lesions at the bivse of the skull freciuently produce this variety ofhemianopsia, if the^ lie posteriorly to the
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