Table of Contents

2017 Month : May Volume : 3 Issue : 1 Page : 1-2

BILATERAL BIPARTITE COMPOSITION OF PECTORAL MAJOR MUSCLE- A CASE REPORT.

Yogesh Yadav1, Madhu Sethi2

Corresponding Author:
Dr. Yogesh Yadav,
Associate Professor,
Department of Anatomy,
Dr. Baba Saheb Ambedkar Medical
College and Hospital,
Rohini, Delhi.
E-mail: dryogeshyadav@gmail.com

ABSTRACT

BACKGROUND

The anatomical variation of the pectoralis major muscles is uncommon, especially the agenesis of the pectoralis major muscle due to the morpho-functional alterations. The presence of supernumerary pectoralis major muscle is not common and their physiological, clinical and surgical importance are depending on the stages of its development. This supernumerary muscle, while crossing the anterior wall of the axilla and inserting on the humerus may confuse the surgeon or make surgical access difficult to the content of the axillary fossa. We observed an anomalous disposition of the muscular slips of pectoralis major on both sides in an adult male cadaver during routine gross anatomy teaching session. The pectoralis major muscle comprised of two heads, sternal and clavicular separated by an intramuscular cleft. The origin and insertion of pectoralis major muscle were as usual and unremarkable. The two slips of muscles on both sides innervated by branches of medial and lateral pectoral nerves. The separate nerve supply to each slip increases its suitability for its use in reconstructive procedures. These variants of the pectoral muscles may also have implications in biomechanical studies.

KEYWORDS

Pectoralis Major Muscle; Muscle; Anomaly; Innervations.

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