A rare accessory coracobrachialis muscle: a review of the literature

Abstract

During previous dissections to investigate the incidence of the third head of the biceps brachii in neonate cadavers an accessory coracobrachialis muscle was unilaterally found in a neonate male cadaver. This muscle originated from the coracoid process and the capsule of the shoulder joint. It was inserted into the antebrachial fascia and the medial epicondyle of the humerus. The coracobrachialis muscle is used as a transposition flap in deformities of infraclavicular and axillary areas and in postmastectomy reconstruction. It is also a guide to the axillary artery during surgery and anesthesia. This additional muscle may cause musculocutaneous or high median nerve paralysis. We were unable to find any similar case in the published literature. The anatomic variations of the coracobrachialis muscle may cause confusion during surgery or evaluation of CT and MRI scans. The French version of this article is available in the form of electronic supplementary material and can be obtained by using the Springer Link server located at http://dx.doi.org/10.1007/s00276-002-0079-5.

Résumé

Au cours de dissections préalables destinées à rechercher l'incidence du troisième chef du muscle biceps brachial sur des cadavres de nouveau-nés, un muscle coraco-brachial accessoire a été trouvé d'un seul côté sur le cadavre d'un garçon nouveau-né. Le muscle naissait du processus coracoïde et de la capsule scapulo-humérale, il se terminait dans le fascia antébrachial et sur l'épicondyle médial de l'humérus. Le muscle coraco-brachial est utilisé comme lambeau dans les déformations des régions infra-claviculaire et axillaire et dans les reconstructions après mastectomie. C'est également un guide pour l'artère axillaire en chirurgie et en anesthésie. Ce muscle supplémentaire pourrait entraîner une paralysie du nerf musculo-cutané ou une paralysie haute du nerf médian. Nous n'avons pu trouver aucun cas similaire dans la littérature. Les variations anatomiques du muscle coraco-brachial peuvent entraîner des confusions au cours de la chirurgie ou des examens par scanner ou IRM.

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Correspondence to C. Kopuz.

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Presented at the 5th National Symposium of Anatomy with International Participation, 25–30 September 1999, Antalya, Turkey

The French version of this article is available in the form of electronic supplementary material and can be obtained by using the Springer Link server located at https://doi.org/10.1007/s00276-002-0079-5

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Kopuz, C., İçten, N. & Yildirim, M. A rare accessory coracobrachialis muscle: a review of the literature. Surg Radiol Anat 24, 405–409 (2002). https://doi.org/10.1007/s00276-002-0079-5

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Keywords

  • Anomaly
  • Coracobrachialis muscle
  • Musculocutaneous nerve
  • Variation
  • Upper extremity
  • Gross anatomy