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Morphometric analysis of the human trigeminal nerve.

H Ezure¹, N Goto, N Nonaka

¹Department of Anatomy, Showa University School of Medicine, 5-8, Hatanodai 1, Shinagawa-ku, Tokyo 142-8555, Japan.

Okajimas Folia Anatomica Japonica

|December 6, 2001

Summary

Morphometric analysis of human trigeminal nerve fibers revealed larger axons in the motor root compared to the sensory root. These findings align with patterns observed in other peripheral nerves regarding axonal size and distribution.

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Area of Science:

Neuroscience
Anatomy
Morphology

Background:

The trigeminal nerve is crucial for facial sensation and motor function.
Understanding the morphometric properties of its nerve fibers is essential for diagnosing and treating related disorders.

Purpose of the Study:

To quantitatively analyze and compare the morphometric characteristics of nerve fibers in the motor and sensory roots of the human trigeminal nerve.

Main Methods:

Morphometric analysis of trigeminal nerve components from five male cadavers (aged 67-95).
Nerves were stained using the Masson-Goldner-Goto method.
Axonal area, perimeter, and size distribution were examined using a morphometric image analyzer.

Main Results:

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Axons in the motor root exhibited larger areas and perimeters than those in the sensory root.

The size distribution of axons was broader in the motor root compared to the sensory root.

Axonal size distribution followed a unimodal pattern in both roots.

Conclusions:

Nerve fibers of the human trigeminal nerve demonstrate morphometric characteristics similar to other peripheral nerves.
Axonal size and distribution patterns in the trigeminal nerve's motor and sensory roots are distinct.
These findings contribute to the understanding of trigeminal nerve anatomy and physiology.