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Rhomboideus Major

Origin: cervical & thoracic vertebrae

Insertion: scapula

Action: Pulls scapula dorsally

Rhomboidieus Minor

Origin: Cervical vertebrae

Insertion: Scapula

Action: Pulls scapula dorsally

Rhomboideus capitis

Origin: Occipital

Insertion: Scapula (angle)

Action: Draws scapula cranially

Splenius

Origin: Mid-dorsal fascial line

Insertion: Lambdoidal ridge

Action: Turns and elevates head

Supraspinatus

Origin: Scapula (Supraspinous fossa)

Insertion: Humerus (Greater Tubercule)

Action: Extends humerus

Infraspinatus

Origin: Scapula (Infraspinous fossa)

Insertion: Humerus (Grater tubercle)

Action: Laterally Rotates Humerus

Teres major

Origin: Scapula (Axillary border)

Insertion: Humerus (Medial surface)

Action: Flexes and Medially rotates humerus

Teres minor

Origin: Scapula (Lateral border)

Insertion: Humerus (Greater tubercle)

Action: Laterally Rotates humerus

Subscapularis

Origin: Subscapular fossa

Insertion: Lesser tubercle of humerus

Action: Draws humerus medially

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