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A new type of the coracobrachialis muscle
Affiliations- Department of Anatomical Dissection and Donation, Medical University of Lodz, Poland
- Department of Orthopaedics Surgery, Hospital Santa Cristina, Madrid, Spain
- Department of Human Anatomy and Embryology, Facultad de Medicina, Universidad Complutense de Madrid, Spain
- 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, West Indies
- Department of Neurology, Tulane University School of Medicine, New Orleans, LA, United States
- Department of Structural and Cellular Biology, Tulane University School of Medicine, New Orleans, LA, United States
- Department of Surgery, Tulane University School of Medicine, New Orleans, LA, United States
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Abstract
The coracobrachialis muscle belongs to the anterior group of the brachial region. Its main functions are flexion and adduction at the glenohumeral joint. It is highly morphologically variable, especially in the number of bellies, place of origin or insertion, and its relationship to the musculocutaneous nerve. Accessory structures associated with the coracobrachialis muscle include the coracobrachialis brevis or coracobrachialis longus muscle. The present case describes a three-headed coracobrachialis muscle with two such additional structures. One of these has a tendinous origin connected to the periosteum and located on the surgical neck of the humerus. Its insertion is fused with the third head of the coracobrachialis muscle. The other has a proximal attachment fused with the capsule of the shoulder joint, and its distal attachment is fused with the third head of the coracobrachialis muscle in place of its connection with the short head of the biceps brachii. This could result in better stabilisation of the glenohumeral joint; on the other hand, it could limit operational access during treatment of subscapularis
tears.
Abstract
The coracobrachialis muscle belongs to the anterior group of the brachial region. Its main functions are flexion and adduction at the glenohumeral joint. It is highly morphologically variable, especially in the number of bellies, place of origin or insertion, and its relationship to the musculocutaneous nerve. Accessory structures associated with the coracobrachialis muscle include the coracobrachialis brevis or coracobrachialis longus muscle. The present case describes a three-headed coracobrachialis muscle with two such additional structures. One of these has a tendinous origin connected to the periosteum and located on the surgical neck of the humerus. Its insertion is fused with the third head of the coracobrachialis muscle. The other has a proximal attachment fused with the capsule of the shoulder joint, and its distal attachment is fused with the third head of the coracobrachialis muscle in place of its connection with the short head of the biceps brachii. This could result in better stabilisation of the glenohumeral joint; on the other hand, it could limit operational access during treatment of subscapularis
tears.
Keywords
coracobrachialis muscle, accessory muscle, case report, coracocapsularis longus, coracobrachialis brevis, morphological variation, embryological development, embryogenesis
About this articleTitle
A new type of the coracobrachialis muscle
Journal
Issue
Article type
Case report
Pages
439-444
Published online
2022-02-28
Page views
2368
Article views/downloads
960
DOI
Pubmed
Bibliographic record
Folia Morphol 2023;82(2):439-444.
Keywords
coracobrachialis muscle
accessory muscle
case report
coracocapsularis longus
coracobrachialis brevis
morphological variation
embryological development
embryogenesis
Authors
N. Zielinska
P. Aragonés
J. R. Sañudo
P. Łabętowicz
R. S. Tubbs
Ł. Olewnik
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