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Potential compression of the musculocutaneous, median and ulnar nerves by a very rare variant of the coracobrachialis longus muscle
, 23, 456, 1, 1, 1, 7
Affiliations- Department of Anatomical Dissection and Donation, Medical University of Lodz, Poland
- Institute of Functional and Clinical Anatomy, Friedrich Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Department of Topographic Anatomy and Operative Surgery, Sechenov University, Moscow, Russia
- Department of Neurosurgery, Tulane University School of Medicine, New Orleans, LA, United States
- Department of Neurosurgery and Ochsner Neuroscience Institute, Ochsner Health System, New Orleans, LA, United States
- Department of Anatomical Sciences, St. George’s University, Grenada
- Department of Normal and Clinical Anatomy, Medical University of Lodz, Poland
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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.
Keywords
anatomical variations, coracobrachialis longus muscle, median nerve, musculocutaneous nerve, ulnar nerve
About this articleTitle
Potential compression of the musculocutaneous, median and ulnar nerves by a very rare variant of the coracobrachialis longus muscle
Journal
Issue
Article type
Case report
Pages
707-713
Published online
2020-08-22
Page views
7001
Article views/downloads
1470
DOI
Pubmed
Bibliographic record
Folia Morphol 2021;80(3):707-713.
Keywords
anatomical variations
coracobrachialis longus muscle
median nerve
musculocutaneous nerve
ulnar nerve
Authors
Ł. Olewnik
F. Paulsen
R. S. Tubbs
N. Zielińska
B. Szewczyk
P. Karauda
M. Polguj
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