Upper Extremity Muscles OIA Flashcards
Trapezius OIA
Origin: external occipital protuberance; C7-C12
Insertion: spine of scapula; acromian process; lateral of clavicle
Actions: elevates, depresses, retracts shoulder girdle
Latissimus Dorsi OIA
O: T7-L5; thoraco-lumbar fascia; iliac crest
I: intertubuclar groove of humerus
A: adducts, medially rotates, extends arm at shoulder girdle
Levator Scapulae (action)
O: –
I: –
A: elevates shoulder girdle/scapula
Rhomboideus major and minor (action)
A: retracts the shoulder girdle
Serratus anterior (action)
O: –
I: –
A: protracts shoulder girdle
Deltoid (anterior, middle, and posterior head) OIA
O: lateral clavicle (anterior); acromion process & spine of scapula; spine of scapula (posterior)
I: deltoid tuberosity
A: flexes, medially rotates, abducts, extends, and laterally rotates at shoulder joint
Supraspinatus OIA
O: supraspinous fossa
I: greater tubercle of humerus
A: abducts, stabilizes arm at shoulder joint
Infraspinatus OIA
O: infraspinous fossa
I: greater tubercle of humerus
A: laterally rotates, abducts, stabilizes arm at shoulder joint
Teres minor IA
O: –
I: greater tubercle of humerus
A: laterally rotates, abducts, and stabilizes arm at shoulder joint
Subscapularis OA
O: subscapular fossa
I: –
A: medially rotates; stabilizes arm at shoulder joint
Teres major (action)
O: –
I: –
A: adducts; medially rotates arm at shoulder girdle
Pectoralis major OIA
O: sternum and clavicle
I: intertubuclar groove of humerus
A: adducts and medially rotates the shoulder joint
Pectoralis minor OIA
O: ribs 3-5
I: coracoid process of scapula
A: protracts shoulder girdle, accessory muscle to inspiration
Biceps Brachii (long & short head) OIA
O: superglenoid tubercle of scapula (long); coracoid process (short)
I: radial tuberosity
A: supinates forearm at radioulnar joint; flexes forarm at elbow joint
Coracobrachialis OIA
O: coracoid process of scapula
I: medial aspect of humerus
A: adducts and flexes arm at shoulder joint
Brachialis (action)
O: –
I: –
A: flexes forearm at elbow joint
Triceps Brachii (long, lateral, medial head) OIA
O: infraglenoid tubercle (long); posterior surface of humerus (lateral); posterior surface of humerus (medial)
I: olecranon process
A: extends forearm at elbow joint
Brachioradialis (action)
O: –
I: –
A: flexes forearm at elbow joint
Pronator teres OA
O: medial epicondyle of humerus
I: –
A: pronates forearm at radioulnar joint
Flexor carpi radialis OA
O: medial epicondyle of the humerus
I: –
A: flexes hand at wrist
Palmaris longus OA
O: Medial epicondyle of humerus
I: –
A: flexes hand at wrist
Flexor digitorum superificialis and profundus OA
O: Medial epicondyle of humerus
I: –
A: flexes digits II-V
Flexor pollicis longus OA
O: Medial epicondyle of humerus
I: –
A: flexes digit I/pollex
Flexor carpi ulnaris OA
O: medial epicondyle of humerus
I: –
A: flexes hand at wrist
