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Pectoralis Major -origin

Clavicle: medial half (anterior); Sternum: sternocostal head from anterior sternum; superior six costal cartilage; aponeurosis of external oblique ms.

Pectoralis Major -insertion

Intertubercular groove of humerus: lateral lip

Pectoralis Major -innervation

Pectoral nerves, lateral and medial (C5-T1)

Pectoralis Major -action

Flexion, adduction, medial rotation of shoulder

Pectoralis Major -relationship

Deltopectoral triangle(f6.15); anterior axillary wall

Pectoralis Minor- origin

Ribs 3-5

Pectoralis Minor- insertion

Coracoid process of scapula

Pectoralis Minor- innervation

Pectoral nerves, medial (C8-T1)

Pectoralis Minor- action

Stabilizes scapula, forced inspiration, anterior tilt of scapula

Pectoralis Minor- relationship

Deep to pec major, used as ms of forced inspiration, forms a bridge under which many axillary structures pass

Subclavius- origin

1st rib

Subclavius- insertion

Clavicle: inferior middle third surface

Subclavius- innervation

Nerve to subclavius (C5-C6)

Subclavius- action

Stabilizes and depresses clavicle, draws clavicle medially

Subclavius- relationship

Protects subclavian artery

Serratus Anterior- origin

ribs 1-9

Serratus Anterior- insertion

Scapula: anterior surface, medial border

Serratus Anterior- innervation

Long Thoracic Nerve (C5-C7)

Serratus Anterior- action

Protraction and upward rotation of scapula (Boxer's ms)

Serratus Anterior- relationship

Nerve damage causes "winged scapula"

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