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Internodal segments in human laryngeal nerves.

P M O'Reilly, M J Fitzgerald

Journal of Anatomy

|June 1, 1985

Summary

Prenatal elongation of laryngeal nerves does not involve internodal segment lengthening in myelinated fibers. This contrasts with spinal nerve roots, suggesting developmental timing differences in myelination and Schwann cell activity influence nerve elongation.

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Area of Science:

Neuroscience
Developmental Biology
Anatomy

Background:

Prenatal development involves significant nerve elongation.
Recurrent laryngeal nerves, particularly the left, undergo substantial prenatal elongation.
Spinal nerve roots of the cauda equina also exhibit elongation during fetal development.

Purpose of the Study:

To investigate if prenatal elongation of recurrent laryngeal nerves is associated with internodal segment elongation in myelinated fibers.
To compare the developmental mechanisms of laryngeal nerve elongation with those of spinal nerve roots.

Main Methods:

Examination of laryngeal nerves from a deceased patient.
Analysis of myelinated fiber internodal segments.

Main Results:

No evidence found supporting significant elongation of internodal segments in the laryngeal nerves.
Laryngeal nerves appear to reach their final anatomical positions before myelination begins.
Spinal nerve roots elongate later in fetal development, after significant Schwann cell multiplication has ceased.

Conclusions:

Prenatal elongation of recurrent laryngeal nerves is not achieved through internodal segment elongation.
The timing of myelination relative to nerve positioning and Schwann cell activity is a key factor differentiating laryngeal and spinal nerve development.

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