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Muscle Nerve. 2014 Nov;50(5):856-8. doi: 10.1002/mus.24297. Epub 2014 Sep 24.

Spinal nerve composition and innervation of the axillary nerve.

Author information

1
Department of Anatomy, Kwandong University College of Medicine, Naegok-Dong 522, Gangneung, 210-701, Korea.

Abstract

INTRODUCTION:

The purpose of this study was to evaluate the spinal nerve composition of the axillary nerve and the contribution of each spinal nerve.

METHODS:

Thirty brachial plexi extracted from Korean adults (15 men, 14 women, 1 unknown; left side, 13; right side, 17) were examined in this study.

RESULTS:

The frequency of the contribution of C4 was 13.3%, and it was mainly innervated the deltoid and teres minor muscles. The frequency of inclusion of C7 was 20.0%. C7 fibers were mainly involved in the deltoid and cutaneous branches. The axillary nerve was primarily composed of fibers from C5 and C6 in 66.6%; C4, C5, and C6 in 13.3%; and C5, C6, and C7 in 20.0%.

CONCLUSIONS:

These findings may be helpful to diagnose damage to axillary nerve structures that occur in such injuries as humerus fractures.

KEYWORDS:

anatomy; axillary nerve; contribution of C4; innervations; participation of C7

PMID:
24862454
DOI:
10.1002/mus.24297
[Indexed for MEDLINE]

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