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Development of synapses in macaque monkey striate cortex.

B S Zielinski1, A E Hendrickson

  • 1Department of Biological Sciences, University of Windsor, Ontario, Canada.

Visual Neuroscience
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

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Synaptic density in the primate visual cortex increases rapidly after birth, peaking at 12 weeks, then declines to adult levels. This development is linked to neuron birthdate, not external pathways.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Electron Microscopy

Background:

  • Synaptic development is crucial for cortical function.
  • Understanding the timeline and patterns of synaptic formation is key to deciphering neural circuit development.

Purpose of the Study:

  • To quantitatively analyze the development of synaptic density in the primary visual cortex of Macaca nemestrina.
  • To compare the morphological development of synaptic contacts across different cortical layers and ages.

Main Methods:

  • Quantitative electron microscopy (EM) was used to analyze synaptic density (synapses/100 microns² neuropil).
  • Comparative EM morphological studies examined developing synaptic contacts.
  • Synaptic density was assessed in different cortical layers (1, 2, 6) across fetal and postnatal ages.

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Main Results:

  • Synaptic contacts appear early (fetal day 75) in layers 1 and 6, with density increasing significantly by fetal day 140.
  • Synaptic density peaks at 12 weeks postnatal (63 synapses/100 microns²) and declines to adult levels (37.7) by 2-6 years.
  • An initial "inside-to-outside" synaptic distribution (higher density in deeper layers) shifts to an "outside-to-inside" pattern by 12 weeks postnatal, with layer 2 surpassing layer 6.
  • Synapse maturation differences between layers diminish post-birth, and mature morphology is acquired between 6-24 weeks postnatal.

Conclusions:

  • Synaptic development in the primate visual cortex follows a complex pattern, primarily influenced by the birthdate of neurons.
  • The observed "inside-to-outside" to "outside-to-inside" shift in synaptic density distribution highlights dynamic layer-specific developmental processes.
  • Synaptic maturation and differentiation continue into adulthood, suggesting prolonged refinement of neural circuits.