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Trapezius
o = occipital bone, ligament nuchae, spinous process of thoracic vertebra
i = outer third of clavicle, scapular spine, acromion
a = adducts, raises/rotates scapula, draws head backwards
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Rhomboideus major
o = spinous process of thoracic vertebra
i = vertebral border of scapula
a = adducts and rotates scapula
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Deltoideus
o = lateral third of clavicle, acromion process and spine of scapula
i = deltoid tuberosity of humerus
abducts arm
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pectoralis major
o = medial half of clavicle, body of sternum, cartilages of ribs 2-6
i = intertubercular groove of humerus
flexes, adducts, medially rotates arm
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pectoralis minor
o = ventral surface of ribs 3-5
i = coracoid process of scapula
draws scapula forward and down, with some rotation
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serratus anterior
o = outer surface of ribs 1- 9
i = ventral surface of scapula near vertebral border
pulls scapula forward and toward chest wall. protracts shoulder
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latissumus dorsi
o = ribs 8-12, spinous process of lower thoracic and lumbar vertebra
i = intertubercular groove of humerus
extends, adducts medially rotates arm
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supraspinatus
o = supraspinous fossa of scapula
i = greater tubercle of humerus
abducts arm
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infrasspinatus
o = infraspinous fossa of scapula
i = greater tubercle of humerus
a = lateral rotation and slight adduction of humerus
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