open access

Vol 75, No 4 (2016)
CASE REPORTS
Published online: 2016-03-17
Submitted: 2015-11-27
Accepted: 2016-02-10
Get Citation

Multiple variations in the course and motor branching pattern of the musculocutaneous nerve with unusual communication with the median nerve

V. Chentanez, P. Jaruprat, P. Udomchaisakul, S. Agthong, T. Huanmanop
DOI: 10.5603/FM.a2016.0014
·
Pubmed: 27830893
·
Folia Morphol 2016;75(4):555-559.

open access

Vol 75, No 4 (2016)
CASE REPORTS
Published online: 2016-03-17
Submitted: 2015-11-27
Accepted: 2016-02-10

Abstract

Anatomic variations in course and motor branching pattern of the musculocutaneous nerve (MCN) with unusual communication with the median nerve were determined on the left arm of a 62-year-old formalin fixed male cadaver. The MCN did not pierce the coracobrachialis muscle. It provided 4 primary motor branches. The first branch emerged 1.5 cm inferior to the coracoid process to innervate the coracobrachialis muscle. The second branch emerged 8 cm inferior to the coracoid process to innervate the biceps brachii muscle. The third branch to brachialis muscle emerged 13.9 cm inferior to the coracoid process. The last branch to the common belly of biceps brachii muscle emerged 19.6 cm inferior to the coracoid process. Two communications with the median nerve were observed. The proximal thick communicating branch had the direction from the MCN to the median nerve while the distal one was a small nerve bundle with a direction from the median nerve to the MCN. The present report provided evidence of multiple variations in one MCN which had not been reported previously. Anatomic variation in this case has clinical implications, considering that injury of the MCN in the upper part of arm would cause unexpected paralysis of flexor muscles of forearm and thenar muscle due to communications between this and median nerve.

Abstract

Anatomic variations in course and motor branching pattern of the musculocutaneous nerve (MCN) with unusual communication with the median nerve were determined on the left arm of a 62-year-old formalin fixed male cadaver. The MCN did not pierce the coracobrachialis muscle. It provided 4 primary motor branches. The first branch emerged 1.5 cm inferior to the coracoid process to innervate the coracobrachialis muscle. The second branch emerged 8 cm inferior to the coracoid process to innervate the biceps brachii muscle. The third branch to brachialis muscle emerged 13.9 cm inferior to the coracoid process. The last branch to the common belly of biceps brachii muscle emerged 19.6 cm inferior to the coracoid process. Two communications with the median nerve were observed. The proximal thick communicating branch had the direction from the MCN to the median nerve while the distal one was a small nerve bundle with a direction from the median nerve to the MCN. The present report provided evidence of multiple variations in one MCN which had not been reported previously. Anatomic variation in this case has clinical implications, considering that injury of the MCN in the upper part of arm would cause unexpected paralysis of flexor muscles of forearm and thenar muscle due to communications between this and median nerve.

Get Citation

Keywords

musculocutaneous nerve, median nerve, communicating branch, motor branch

About this article
Title

Multiple variations in the course and motor branching pattern of the musculocutaneous nerve with unusual communication with the median nerve

Journal

Folia Morphologica

Issue

Vol 75, No 4 (2016)

Pages

555-559

Published online

2016-03-17

DOI

10.5603/FM.a2016.0014

Pubmed

27830893

Bibliographic record

Folia Morphol 2016;75(4):555-559.

Keywords

musculocutaneous nerve
median nerve
communicating branch
motor branch

Authors

V. Chentanez
P. Jaruprat
P. Udomchaisakul
S. Agthong
T. Huanmanop

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