Abstract
Corresponding retinal nerve fibres begin their path in the eyes and end in a single visual cortical cell. Because of this arrangement, lesions in the anterior visual pathway produce incongruent visual field defects and in the posterior pathway congruent field defects. The lateral geniculate body is on the anterior third of the visual pathway. A lesion of this nucleus produces moderately to completely congruent visual field defects. Five patients with ischaemic lesions of the lateral geniculate body are reported. Two patients had a wedge-shaped homonymous hemianopia, two other cases had congruent superior homonymous quadratic defects and the fifth a quadruple sector defect. The lateral geniculate body has a dual blood supply from the anterior choroidal artery (branch from internal carotid artery) and from the lateral choroidal artery (branch from the posterior cerebral artery). A schematic diagram has been devised which shows that a knowledge of the visual field disrupted can identify the arterial system involved.
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- Frisén L. Quadruple sectoranopia and sectorial optic atrophy: a syndrome of the distal anterior choroidal artery. J Neurol Neurosurg Psychiatry. 1979 Jul;42(7):590–594. doi: 10.1136/jnnp.42.7.590. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gunderson C. H., Hoyt W. F. Geniculate hemianopia: incongruous homonymous field defects in two patients with partial lesions of the lateral geniculate nucleus. J Neurol Neurosurg Psychiatry. 1971 Feb;34(1):1–6. doi: 10.1136/jnnp.34.1.1. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Mohr J. P., Leicester J., Stoddard L. T., Sidman M. Right hemianopia with memory and color deficits in circumscribed left posterior cerebral artery territory infarction. Neurology. 1971 Nov;21(11):1104–1113. doi: 10.1212/wnl.21.11.1104. [DOI] [PubMed] [Google Scholar]
- SMITH J. L. Homonymous hemianopia. A review of one hundred cases. Am J Ophthalmol. 1962 Oct;54:616–623. [PubMed] [Google Scholar]
- Shacklett D. E., O'Connor P. S., Dorwart R. H., Linn D., Carter J. E. Congruous and incongruous sectoral visual field defects with lesions of the lateral geniculate nucleus. Am J Ophthalmol. 1984 Sep 15;98(3):283–290. doi: 10.1016/0002-9394(84)90317-9. [DOI] [PubMed] [Google Scholar]