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Six-headed coracobrachialis muscle
Affiliations- Department of Anatomical Dissection and Donation, Medical University of Lodz, Poland
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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.
Keywords
coracobrachialis muscle, morphological variations, compression, additional head, quadriceps femoris, biceps brachii, embryology, clinical implications
About this articleTitle
Six-headed coracobrachialis muscle
Journal
Issue
Article type
Case report
Published online
2021-08-24
Page views
357
Article views/downloads
202
DOI
10.5603/FM.a2021.0082
Pubmed
Keywords
coracobrachialis muscle
morphological variations
compression
additional head
quadriceps femoris
biceps brachii
embryology
clinical implications
Authors
N. Zielinska
Ł. Olewnik
