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Glossary of Muscle orgin and actions

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O- Occipital bone
C7-T12
I- Clavicle and Scapula
A- Elevation, upward rotation and retraction of scapula
Trapezius
O- Outer surface of upper ribs
I- Scapula
A- Stabilizes scapula against chest wall, pulls shoulder forward
Serratus Anterior
O-Clavicle, Sternum Xostal Cartilage of upper 6 ribs
I- humerus
A- Flexes upper arm, adducts upper arm, Medial rotation, and adduction across chest
Pectoralis Major
O- Aponeurosis from T7- to Illiac crest: lower 3/4 ribs, Inferior angle of scapula
I-Humerus ( bicipital groove)
A- Extends upper arm, adducts upper arm posteriorly, medial rotation of arm
Latissimus Dorsi
O- Scapula
I- Humerus ( bicipital groove)
A- Assista Latissumus Dorsi in extention, adduction and medial rotation of arm
Teres Major
O- clavicle, scapula
I-Humerus ( deltoid tuberosity)
A- Abducts upper arm; assists flexion and medial rotation of humerus
Deltoid
O- C1-C4
I-Scapula
A- Elevation and downqward rotation on scapula
Levator Scapula
O- C7-T-5
I-Scapula
A- Retraction and downward rotation of scapula
Rhomboids
O-Scapula
I-Humerus
A-Rotates arm outward; extention of humer
Sufraspinatus
O- Scapula
I-Humerus
A- Rotates arm outward;
extentiopn of humerus
Infraspinatus
O-Scapula
I-Humerus
A-Rotates arm medially
Subscapularis
O-Scapula
I-Radius
A- Flexion of humerus. Supination of hand
Biceps Brachii
O-Humerus
I-Ulna
A-flexes forearm at the elbow
( stongest elbow flexor)
Brachialis
O- Scapula
I-humerus
A-Flexion ; adduction of humerus
Coracobrachialis
O-Humerus
I-radius
A- Flexion of Elbow
Brachioradialis
O- Scapula, Humerus
I-Ulna
A- Extends lower are (ulna)
extension of humerus
Triceps Brachii

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