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Electron-lucent degenerating geniculate terminals in cat striate cortex.

J F Dashe1, T L Davis

  • 1Department of Anatomy, University of Pennsylvania School of Medicine, Philadelphia 19104.

Brain Research
|December 29, 1989
PubMed
Summary
This summary is machine-generated.

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Degenerating geniculate axon terminals in cats exhibit both electron-dense and electron-lucent appearances. Electron-lucent terminals, found primarily in layer 4 of the striate cortex, contact dendritic spines and are a significant component of degeneration.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Visual System Research

Background:

  • Previous studies characterized degenerating geniculate axon terminals in cat striate cortex as electron-dense.
  • The lateral geniculate nucleus (LGN) is the primary relay for visual information to the striate cortex.

Purpose of the Study:

  • To investigate the morphology and distribution of degenerating axon terminals in the cat striate cortex following LGN lesions.
  • To characterize a previously under-described type of electron-lucent degeneration.

Main Methods:

  • Electrolytic lesion of the lateral geniculate nucleus in cats.
  • Electron microscopic examination of the striate cortex, focusing on layer 4.
  • Morphological analysis and quantification of degenerating terminal types and their synaptic contacts.

Related Experiment Videos

Main Results:

  • Observed electron-lucent degenerating terminals in layer 4 of the striate cortex, co-existing with electron-dense terminals.
  • Electron-lucent terminals displayed a pale matrix, large size, distorted mitochondria, and few synaptic vesicles, preferentially contacting dendritic spines (82.5%).
  • These lucent terminals were abundant in layer 4, rare in layer 6, and absent in other striate cortex layers.

Conclusions:

  • Geniculate axon terminals in the cat striate cortex undergo both electron-lucent and electron-dense degeneration.
  • The electron-lucent degeneration pathway represents a significant portion of the observed degeneration.
  • The distribution of lucent terminals aligns with known LGN projections to the striate cortex.