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Shoulder/Arm Muscles

Superficial and deep muscles of the shoulder and arm

TermDefinition
Trapezius Origin: posterior occipital bone, igentum nuchae, C7-T12; Insertion: clavicle, acromion, and spine of scapula; Action: extends and abducts head, rotates and adducts scapula, fixes scapula
Deltoid Origin: clavicle, acromion, spine of scapula; Insertion: deltoid tuberosity of the humerus; Action: abducts arm, flexes, extends, medially, and laterally rotates arm
Pectoralis Major Origin: clavicle, sternum, cartilages of ribs 1-7; Insertion: crest of greater tubercle of humerus; Action: flexes, adducts, and medially rotates arm
Pectoralis Minor Origin: ribs 3-5; Insertion: coracoid process of scapula; Action: depresses glenoid cavity, raises ribs 3-5
Latissimus Dorsi Origin: T7-12, L1-5, S1-5, crest of ilium, ribs 10-12; Insertion: intertubercular groove of humerus; Action: extends, adducts, and medially rotates arm, draws shoulder inferiorly
Supraspinatus Origin: suprapinous fossa; Insertion: greater tubercle of humerus; Action: abducts arm, helps stabilize shoulder joint
Infraspinatus Origin: infraspinous fossa; Insertion: greater tubercle of humerus; Action: laterally rotates arm, stabilize shoulder joint
Subscapularis Origin: subscapular fossa; Insertion: lesser tubercle of humerus; Action: medially rotates arm, stabilizes shoulder joint
Teres Minor Origin: lateral border of scapula; Insertion: greater tubercle of humerus; Action: laterally rotates and adducts arm, stabilizes shoulder joint
Teres Major Origin: inferior angle of scapula; Insertion: crest of lesser tubercle of humerus; Action: extends, adducts, and medially rotates arm
Biceps Brachii Origin: long head: superior margin of glenoid cavity, short head: coracoid process of scapula; Insertion: radial tuberosity; Action: flexes arm, flexes forearm, supinates hand
Triceps Brachii Origin: infraglenoid tuberosity of scapula, lateral and posterior surface of humerus; Insertion: olranon process, tuberosity of ulna; Action: extends and adducts arm, extends forearm
Coracobrachialis Origin: coracoid process of scapula; Insertion: midmedial shaft of humerus; Action: flexes and adducts arm
Brachialis Origin: anterior, distal surface of humerus; Insertion: coronoid process of ulna; Action: flexes forearm
Brachioradialis Origin: lateral supracondylar ridge of humerus; Insertion: styloid process of radius; Action: flexes forearm
Created by: koalas2013
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