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ORIGINAL ARTICLES
Published online: 2020-04-10
Submitted: 2020-03-17
Accepted: 2020-04-02
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The terminal branch of the posterior interosseous nerve: an anatomic and histologic study

T. Bonczar, J. A. Walocha, M. Bonczar, E. Mizia, M. Koziej, P. Piekos, M. Kujdowicz
DOI: 10.5603/FM.a2020.0041
·
Pubmed: 32301104

open access

Ahead of Print
ORIGINAL ARTICLES
Published online: 2020-04-10
Submitted: 2020-03-17
Accepted: 2020-04-02

Abstract

Background: The aim of this study was to evaluate the terminal branch of the posterior interosseous nerve (PIN) by anatomically and histologically assessing the number, dimension, and area of its individual fascicles, by determining the dimension and area of the whole nerve itself, and by calculating the nerve density ratio (ratio of the sum of the areas of individual fascicles to the area of the whole nerve) of the terminal branch of the PIN.

Methods: Twenty-eight terminal branches of the PIN nerve samples were collected from patients undergoing partial denervation of the wrist. The nerve samples were fixed in 10% buffered formalin and stained with hematoxylin and eosin to visualize their nerve bundles. Quantitative analysis of individual fascicles and the whole nerve itself were carried out.

Results: Ten nerve samples (35,7%) had one single fascicle (group 1) while the remaining 18 nerve samples (64,3%) contained 2-9 fascicles (group 2). The difference in the sum of the areas of individual fascicles between the two groups did not constitute a statistical difference. Statistically significant differences (p <0.05) were seen between area of whole nerve, percentage of fascicles to the nerve surface and the cross-section maximum nerve length and width.

Conclusions: The number of nerve fascicles in the terminal branch of the PIN does not affect the overall size of the nerve. The majority of the volume of multi-fascicle nerves, therefore, primarily consists of the internal perineurium. However, due to the low number of nerves, this question cannot be clearly answered. This sets a further direction for further research on a larger group.

Abstract

Background: The aim of this study was to evaluate the terminal branch of the posterior interosseous nerve (PIN) by anatomically and histologically assessing the number, dimension, and area of its individual fascicles, by determining the dimension and area of the whole nerve itself, and by calculating the nerve density ratio (ratio of the sum of the areas of individual fascicles to the area of the whole nerve) of the terminal branch of the PIN.

Methods: Twenty-eight terminal branches of the PIN nerve samples were collected from patients undergoing partial denervation of the wrist. The nerve samples were fixed in 10% buffered formalin and stained with hematoxylin and eosin to visualize their nerve bundles. Quantitative analysis of individual fascicles and the whole nerve itself were carried out.

Results: Ten nerve samples (35,7%) had one single fascicle (group 1) while the remaining 18 nerve samples (64,3%) contained 2-9 fascicles (group 2). The difference in the sum of the areas of individual fascicles between the two groups did not constitute a statistical difference. Statistically significant differences (p <0.05) were seen between area of whole nerve, percentage of fascicles to the nerve surface and the cross-section maximum nerve length and width.

Conclusions: The number of nerve fascicles in the terminal branch of the PIN does not affect the overall size of the nerve. The majority of the volume of multi-fascicle nerves, therefore, primarily consists of the internal perineurium. However, due to the low number of nerves, this question cannot be clearly answered. This sets a further direction for further research on a larger group.

Get Citation

Keywords

terminal branch of the posterior interosseous nerve, wrist denervation, posterior interosseous nerve fascicles, nerve graft

About this article
Title

The terminal branch of the posterior interosseous nerve: an anatomic and histologic study

Journal

Folia Morphologica

Issue

Ahead of Print

Published online

2020-04-10

DOI

10.5603/FM.a2020.0041

Pubmed

32301104

Keywords

terminal branch of the posterior interosseous nerve
wrist denervation
posterior interosseous nerve fascicles
nerve graft

Authors

T. Bonczar
J. A. Walocha
M. Bonczar
E. Mizia
M. Koziej
P. Piekos
M. Kujdowicz

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