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Extrinsic Chest Muscles

Thoracic Outlet – Functional Anatomy

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Extrinsic Chest Muscles – Functional Anatomy

The anatomy of the extrinsic chest muscles is more complicated than the first glance suggests. They originate on the front of the axial skeleton and insert on the upper extremity. Generally speaking, they protract the scapula and draw the humerus toward the midline. This arrangement gets a little more complicated with the pectoralis major. The …

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Subclavius- Functional Anatomy

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Serratus Anterior – Functional Anatomy

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Pectoralis Minor – Functional Anatomy

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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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