A rare bilateral variant of the coracobrachialis muscle with supernumerary heads and coexisted variant branching patterns of the brachial plexus and the axillary artery

Dimitrios Filippou; Maria Piagkou; Konstantinos Natsis; Dimitrios Chytas; Georgia Kostare; George Triantafyllou; Evangelos Kostares; Christos Koutserimpas; Trifon Totlis; Marios Salmas; Vasilios Karampelias; George Tsakotos

doi:10.1007/s00276-023-03088-w

January 24, 2023Surgical and Radiologic AnatomyOpen Access

A rare bilateral variant of the coracobrachialis muscle with supernumerary heads and coexisted variant branching patterns of the brachial plexus and the axillary artery

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Key Points

To describe a rare bilateral anatomical variation involving supernumerary heads of the coracobrachialis muscle along with coexisting branching patterns of the brachial plexus and axillary artery.
Documented anatomical variations via bilateral upper limb dissection, evaluating the structural orientation of accessory muscle heads and adjacent neurovascular bundles.
Identified bilateral supernumerary heads of the coracobrachialis muscle alongside concurrent branching variations of the brachial plexus and the axillary artery.
Determined that the anatomical course of the accessory heads creates potential entrapment points for the musculocutaneous nerve, median nerve, and brachial artery.
Noted that compression of the musculocutaneous nerve by these variant muscular structures precipitates impaired glenohumeral joint flexion and adduction, as well as numbness and tingling across the elbow, lateral forearm, and hand.

Implication

Reveals rare bilateral coracobrachialis variants and neurovascular anomalies, suggesting increased risk of musculocutaneous nerve entrapment and upper limb dysfunction.

Abstract

Course and direction of the accessory CB heads may occasionally entrap the MCN and/or adjacent structures (brachial artery and MN). The MCN compression results in problems in the glenohumeral joint flexion and adduction, and tingling or numbness of the elbow joint, the forearm lateral parts and the hand.

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Cite This Study

Filippou et al. (2023) studied this question.

synapsesocial.com/papers/69dfed4b60d9fa30ca7a1057 https://doi.org/10.1007/s00276-023-03088-w

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A rare bilateral variant of the coracobrachialis muscle with supernumerary heads and coexisted variant branching patterns of the brachial plexus and the axillary artery

Key Points

Implication

Abstract

Discussion

Cite This Study

A rare bilateral variant of the coracobrachialis muscle with supernumerary heads and coexisted variant branching patterns of the brachial plexus and the axillary artery

Key Points

Implication

Abstract

Discussion

Cite This Study

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