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Scapulohumeral Muscl

Muscle,Origin, Insertion, and Action

MuscleOriginInsertionAction
Pectoralis Major Origin Clavicle Sternum Costal Cartilage of upper 6 ribs Insertion Humerus (bicipital groove) Flexes upper arm; adducts upper arm anteriorly; draws it across chest(horizontal adduction) Medial rotation of humerus
Pectoralis Minor Origin Anterior 3,4,5 ribs Insertion Scapula (coracoid process) Pulls shoulder down and forward. Abducts scapula
Latissimus Dorsi Origin Aponeurosis from T7 to Iliac Crest, Lower 3 or 4 ribs, Inferior angle of Scapula Insertion Humerus (bicipital groove) Extends upper arms; adducts upper arm posteriorly; medial rotation of arm
Teres Major Origin Scapula Insertion Humerus (bicipital groove) Assists Latissumus Dorsi in extension, adduction, and medial rotation of arm
Deltoid Origin Clavicle Scapula Insertion Humerus (deltoid tuberosity) Abducts upper arm; assists flexion & medial rotation of humerus
Levator Scapula Origin C1-C4 (transverse processes) Insertion Scapula Elevation & downward rotation of scapula
Rhomboids Origin C7-T5 (spinous processes) Insertion Scapula Retraction & downward rotation of scapula
Supraspinatus Origin Scapula Insertion Humerus Stabilizes head of humerus & initiates abduction of humerus
Infraspinatus Origin Scapula Insertion Humerus Rotates arm outward (lateral rotation); extension of humerus
Teres Minor Origin Scapula Insertion Humerus Rotates arm outward; extention of humerus
Subscapularis Origin Scapula Insertion Humerus Rotates arm medially
Biceps Brachii Origin Scapula Insertion Radius Flexion of humerus. Supination of hand
Brachialis Origin Humerus Insertion Ulna Flexes forearm at the elbow (strongest elbow flexor)
Coracobrachialis Origin Scapula Insertion Humerus Flexion; adduction of humerus
Brachioradialis Origin Humerus Insertion Radius Flexion of elbow
Triceps Brachii Origin Scapula, Humerus Insertion Ulna Extends lower arm. Extension of humerus
Trapezius Origin Occipital Bone C7-T12 (spinous processes) Insertion Clavicle Scapula Elevation, upward rotation and retraction of scapula. Extends head when occipital acts as insertion.
Serratus Anterior Origin Outer surface of upper 8 ribs Insertion Scapula Pulls shoulder forward; protracts & rotates it upward. Stabilizes scapula against chest wall
Created by: inetta
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