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Related Experiment Video

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The human trochlear and abducens nerves at different ages - a morphometric study.

Muthu Ramkumar1, Saroj Sharma1, Tony G Jacob1

  • 1Department of Anatomy, All India Institute of Medical Sciences, New Delhi-110608, India.

Aging and Disease
|February 7, 2015
PubMed
Summary
This summary is machine-generated.

This study provides essential morphometric data for the trochlear (TN) and abducens (AN) nerves across various age groups. Findings reveal no significant changes in nerve or axonal size with aging, but increased myelin thickness in the AN.

Keywords:
morphometrymyelin thicknessocular motor nervesstereology

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Area of Science:

  • Neuroanatomy
  • Ophthalmology
  • Nerve Morphology

Background:

  • The trochlear nerve (TN) and abducens nerve (AN) are crucial for eye movement, controlling superior oblique and lateral rectus muscles respectively.
  • Clinical and radiological studies highlight their importance, yet comprehensive age-specific morphometric data was lacking.
  • This deficiency hindered comparisons in pathological or other related conditions.

Purpose of the Study:

  • To establish baseline morphometric data for the human trochlear nerve (TN) and abducens nerve (AN) across a wide age spectrum.
  • To investigate age-related changes in nerve and axonal morphology, including myelination.
  • To provide reference data for clinical and research applications.

Main Methods:

  • Morphometric analysis of TN and AN from twenty post-mortem human samples (ages 12-90 years).
  • Nerve samples processed for resin embedding, sectioned, and stained with toluidine blue.
  • Axon counts (fractionator method) and cross-sectional/axonal areas (point counting) were estimated.

Main Results:

  • The TN exhibited a well-defined epineurium and ill-defined fascicles, while the AN had multiple fascicles with scanty epineurium.
  • Total myelinated fibers ranged from 1100-3000 in TN and 1600-7000 in AN across ages.
  • No significant changes in nerve or axonal cross-sectional area were observed with age; however, myelin thickness in the AN significantly increased with aging.

Conclusions:

  • This study presents the first comprehensive baseline morphometric data for human TN and AN across diverse age groups.
  • Age does not significantly alter the overall size of these nerves or their axons, but impacts myelin thickness in the AN.
  • The findings offer valuable reference data for understanding age-related nerve changes and pathologies.