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Related Experiment Videos

Myelinated axons and the pyramidal cell modules in monkey primary visual cortex

A Peters1, C Sethares

  • 1Department and Anatomy and Neurobiology, Boston University School of Medicine, Massachusetts 02118, USA.

The Journal of Comparative Neurology
|February 5, 1996
PubMed
Summary
This summary is machine-generated.

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The macaque visual cortex features vertical myelinated axon bundles, potentially carrying unique information from pyramidal cell modules. These bundles connect neurons within and between cortical layers.

Area of Science:

  • Neuroscience
  • Visual Cortex Anatomy
  • Cellular Neuroscience

Background:

  • The macaque primary visual cortex (V1) exhibits horizontal myelinated axon bands (line of Gennari, inner band of Baillarger).
  • Prominent vertical bundles of myelinated axons are also present in V1.

Purpose of the Study:

  • To investigate the structure, arrangement, and potential function of vertical myelinated axon bundles in the macaque primary visual cortex.

Main Methods:

  • Tangential sections of macaque primary visual cortex were analyzed.
  • Axon counts and spacing measurements were performed in different cortical layers.
  • Electron microscopy was used to visualize axon bundles and pyramidal cell dendrites.
  • Pyramidal cell axons were traced from superficial layers (II/III, IVA, IVB) to deeper layers.

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Main Results:

  • Vertical axon bundles in layer IVC are regularly spaced (~23 microns center-to-center) and contain ~34 myelinated axons.
  • Axons from superficial pyramidal cells descend towards the white matter in these bundles.
  • Bundle axon counts decrease in layers V and VI, suggesting some axons enter layer V's Baillarger band.
  • Axon bundles are spatially associated with apical dendrite clusters of layer V pyramidal cells.
  • Bundles contain both myelinated and unmyelinated axons, indicating inter-laminar connections.

Conclusions:

  • Vertical myelinated axon bundles likely transmit efferent information from pyramidal cell modules.
  • These bundles may represent basic functional units of the visual cortex, carrying unique information.
  • The bundles also serve as conduits for inter-laminar connections.