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CASE REPORTS
Published online: 2020-08-22
Submitted: 2020-07-18
Accepted: 2020-07-21
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Potential compression of the musculocutaneous, median and ulnar nerves by a very rare variant of the coracobrachialis longus muscle

Ł. Olewnik, F. Paulsen, R. Shane Tubbs, N. Zielinska, B. Szewczyk, P. Karauda, M. Polguj
DOI: 10.5603/FM.a2020.0085
·
Pubmed: 32844391

open access

Ahead of Print
CASE REPORTS
Published online: 2020-08-22
Submitted: 2020-07-18
Accepted: 2020-07-21

Abstract

The coracobrachialis longus muscle (CBL) is an extremely rare variant of the coracobrachialis muscle (CRM). The CBL originates from the apex of the coracoid process together with the short head of the biceps brachii and inserts on the olecranon of the ulna. The CBL consists of three parts: a superior part (classical CRM - length 137.88 mm), a middle fibrous layer (23.41 mm), and an inferior part (185.37 mm). A rare relationship between the CBL and median, musculocutaneous and ulnar nerves was observed with potential compression at these three parts. In addition, this case report describes a connection between CBL and the medial head of the triceps brachii, as well as a third head of the biceps brachii, which originate from the fibrous layer. This case report highlights the relationships between the CBL and the median, ulnar and musculocutaneous nerves.

Abstract

The coracobrachialis longus muscle (CBL) is an extremely rare variant of the coracobrachialis muscle (CRM). The CBL originates from the apex of the coracoid process together with the short head of the biceps brachii and inserts on the olecranon of the ulna. The CBL consists of three parts: a superior part (classical CRM - length 137.88 mm), a middle fibrous layer (23.41 mm), and an inferior part (185.37 mm). A rare relationship between the CBL and median, musculocutaneous and ulnar nerves was observed with potential compression at these three parts. In addition, this case report describes a connection between CBL and the medial head of the triceps brachii, as well as a third head of the biceps brachii, which originate from the fibrous layer. This case report highlights the relationships between the CBL and the median, ulnar and musculocutaneous nerves.

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Keywords

anatomical variations, coracobrachialis muscle, coracobrachialis longus, median nerve, musculocutaneous nerve, ulnar nerve

About this article
Title

Potential compression of the musculocutaneous, median and ulnar nerves by a very rare variant of the coracobrachialis longus muscle

Journal

Folia Morphologica

Issue

Ahead of Print

Published online

2020-08-22

DOI

10.5603/FM.a2020.0085

Pubmed

32844391

Keywords

anatomical variations
coracobrachialis muscle
coracobrachialis longus
median nerve
musculocutaneous nerve
ulnar nerve

Authors

Ł. Olewnik
F. Paulsen
R. Shane Tubbs
N. Zielinska
B. Szewczyk
P. Karauda
M. Polguj

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