Visual Disturbances Associated With Head Injuries

Greear, James N.; McGAVIC, John S.

doi:10.1001/archopht.1946.00890210036003

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…We are therefore justified in accepting the evidence that a partial lesion of one occipital pole will produce a scotoma reaching to the fixation point, and therefore we must conclude that the " macula " is represented strictly unilaterally. Holmes and Lister (1916) and Lister and Holmes (1916) reached the same conclusion from their experience in the first world war, as did Greear and McGavic (1946) in the second world war, and Putnam and Liebman (1942) from an extensive review of the literature. The advocates of bilateral representation of the " macula " postulate a tract from one lateral geniculate body to the opposite striate cortex crossing the midline in the corpus callosum, but Putnam and Liebman conclude that on the one hand there is no good evidence to show that such a tract exists and on the other there is a great deal of evidence that it does not.…”

Section: Discussionmentioning

confidence: 73%

Wounds of the Visual Pathway: Part Ii: The Striate Cortex

Spalding¹

1952

Journal of Neurology, Neurosurgery & Psychiatry

103

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Section: Discussionmentioning

confidence: 73%

Wounds of the Visual Pathway: Part Ii: The Striate Cortex

Spalding¹

1952

Journal of Neurology, Neurosurgery & Psychiatry

103

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Transsynaptic Degeneration in the Visual System

HADDOCK¹

1950

Arch NeurPsych

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THE OCCASION for this report was the finding of progressive development of bilateral primary optic nerve atrophy five and onehalf years after an extensive penetrating gunshot wound of both occipital lobes. There was no definite evidence of injury to the optic nerves or tracts to account for this atrophy, and it appeared probable that a transsynaptic degeneration had occurred. A search of the literature revealed that transsynaptic degeneration in the visual system had been mentioned by several writers but that few case reports had been included. Because degeneration of the optic nerve is not ordinarily anticipated after lesions of the occipital lobe, we believe it advisable that this problem be reviewed.When an axon within the central nervous system is sectioned, the distal segment degenerates up to the synapse but produces no pathologic change in the cell on which it terminates. There are a few instances in which degeneration of an axon not only progresses up to the synapse but also effects degenerative changes in the contiguous neuron. This phenomenon is called transneuronal,1 or transsynaptic degeneration.2 It occurs in an area that, deriving its innervation predominantly from one source, becomes isolated from its chief source of innervation. The best known example is the degeneration of the lateral genticulate bodies following destruction of the neurons in the retina.

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Trauma to the Head by Particular Reference to the Ocular Signs*

King¹,

Walsh²

1949

American Journal of Ophthalmology

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Visual Disturbances Associated With Head Injuries

Cited by 3 publications

References 9 publications

Wounds of the Visual Pathway: Part Ii: The Striate Cortex

Wounds of the Visual Pathway: Part Ii: The Striate Cortex

Transsynaptic Degeneration in the Visual System

Trauma to the Head by Particular Reference to the Ocular Signs*

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