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Thoracic Outlet Anatomy

Thoracic Outlet – Functional Anatomy

The anatomy of thoracic outlet structures is complex in several ways. First, many of the bones are both origin and insertion for muscles. Second, several of the muscles have statistically significant variations in cadaver studies. Here, you will find a brief overview of Thoracic Outlet Syndrome followed by a walk-through of the structures from back …

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Scalene Muscles – Functional Anatomy

Scalenes are 3 (sometimes 4) muscles on either side of the neck. The three bellies are named for their position; scalenus anterior, scalenus medius, scalenus posterior. The anomalous belly is called scalenus minimus.They are lateral cervical muscles that connect the cervical vertebrae to the upper thoracic cage. They are long muscles with fibers of uneven …

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Subclavius- Functional Anatomy

The subclavius is a short, thick triangular muscle along the inferior aspect of the clavicle. Origin – first rib Insertion – medial clavicle. Function – lowers clavicle. The origin is a flat tendon that attaches on the first rib, near the sternal cartilage. It gradually transitions to muscle fibers. The insertion is a tendon that …

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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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