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Extrinsic Chest Muscles

Serratus Anterior – Functional Anatomy

The anatomy of the serratus anterior muscle is complex. Strangely, it can both elevate and depress the scapula. It has statistically significant variations in the number of sections. Also, it is positioned underneath the other extrinsic pectoral muscles and not often shown in dissections. Quick Review of the Serratus Anterior The serratus anterior is a …

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Pectoralis Minor – Functional Anatomy

Pectoralis minor is a fan-shaped muscle in the front of the shoulder that secures the lateral angle of the scapula to the rib cage. Superficially, it is covered by the pectoralis major. Brief Anatomy Overview Origin ribs 3-5 Insertion coracoid process of the scapula Function protracts scapula depresses scapula Assists in labored breathing Innervation medial pectoral nerve …

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Pectoralis Major – Functional Anatomy

Dissection studies show that the pectoralis major varies dramatically. There are commonly 2-5 laminates, sometimes 6 or 7, and sometimes the entire pectoralis is missing (Poland Syndrome). Also, the overlap of sections varies among studies. The variation illustrated here is common and I used it because, well, it was fun to illustrate and shows how differently …

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