open access

Ahead of Print
Case report
Submitted: 2021-05-29
Accepted: 2021-07-19
Published online: 2021-08-24
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Six-headed coracobrachialis muscle

N. Zielinska1, Ł. Olewnik1
DOI: 10.5603/FM.a2021.0082
·
Pubmed: 34608984
Affiliations
  1. Department of Anatomical Dissection and Donation, Medical University of Lodz, Poland

open access

Ahead of Print
CASE REPORTS
Submitted: 2021-05-29
Accepted: 2021-07-19
Published online: 2021-08-24

Abstract

The coracobrachialis muscle is the smallest muscle of the anterior compartment of the arm. It is responsible for flexion and abduction in the glenohumeral joint. The coracobrachialis muscle is morphologically variable both, in its insertion and origin. Moreover, some additional heads or structures may also occur. The present report describes a six-headed coracobrachialis muscle originated as a common junction with the the short head of the biceps brachii muscle from the coracoid process. All of these heads insert into the medial surface of the humeral shaft. It is important to note that the musculocutaneous nerve was piercing the fourth belly. Other heads were innervated by branches from the musculocutaneous nerve. Knowledge of the morphological variability of this muscle is essential not only for anatomists but for clinicians as well.

Abstract

The coracobrachialis muscle is the smallest muscle of the anterior compartment of the arm. It is responsible for flexion and abduction in the glenohumeral joint. The coracobrachialis muscle is morphologically variable both, in its insertion and origin. Moreover, some additional heads or structures may also occur. The present report describes a six-headed coracobrachialis muscle originated as a common junction with the the short head of the biceps brachii muscle from the coracoid process. All of these heads insert into the medial surface of the humeral shaft. It is important to note that the musculocutaneous nerve was piercing the fourth belly. Other heads were innervated by branches from the musculocutaneous nerve. Knowledge of the morphological variability of this muscle is essential not only for anatomists but for clinicians as well.

Get Citation

Keywords

coracobrachialis muscle, morphological variations, compression, additional head, quadriceps femoris, biceps brachii, embryology, clinical implications

About this article
Title

Six-headed coracobrachialis muscle

Journal

Folia Morphologica

Issue

Ahead of Print

Article type

Case report

Published online

2021-08-24

DOI

10.5603/FM.a2021.0082

Pubmed

34608984

Keywords

coracobrachialis muscle
morphological variations
compression
additional head
quadriceps femoris
biceps brachii
embryology
clinical implications

Authors

N. Zielinska
Ł. Olewnik

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