Upper Extremity Muscle Actions Flashcards
Supraspinatus action
assists deltoid in abduction of humerus at shoulder
Infraspinatus action
external rotation of the humerus at the shoulder joint
Teres minor action
Assists with adduction and rotation of arm laterally
Subscapularis action
Internal rotation of the arm at the shoulder
Deltoid
Abducts, flexes, extends, and rotates arm at shoulder joint
Trapezius action
Superior Fibers elevate scapula
Middle fibers adduct scapula
Inferior fibers depress and upward rotate scapula
Stabilizes the scapula
Levator Scapula action
Elevates scapula and rotates downward
Rhomboid Major action
- Elevates and adducts scapula and rotates it downward
- Stabilizes scapula
Pectoralis Major action
Adducts and rotates arm medially at shoulder
Flexes arm at shoulder joint
Latissimus dorsi action
Extends, adducts and rotates arm medially at the shoulder joint
Draws arm downward and backward
Teres major
Extends arm at shoulder joint
Assists with adduction and rotation of arm medially
Coracobrachialis
Flexes and adducts arm at shoulder
Brachialis
Flexes forearm at the elbow joint
Biceps Brachii
Flexes and supinates forearm at the elbow joint
Flexes arm at the shoulder
Brachioradialis
Flexes forearm at elbow joint
triceps brachii
Extends forearm at elbow joint
Extends arm at shoulder
Supinator
Supinates Forearm
Pronator Teres
Pronates Forearm
Flexor Carpi radialis
Flexes and abducts hand at the wrist
Flexor carpi ulnaris
Flexes and adducts hand at wrist
Palmaris.
Weakly flexes hand at wrist joint
Flexor digitorum superficialis
Flexes hand at wrist joint
Flexes phalanges of each finger at the PIP joint
Flexor Digitorum Profundus
Flexes hand at wrist
Flexes phalanges of each finger at DIP joint
Extensor Carpi Radialis Longus
Extends and abducts hand at the wrist joint
Extensor Carpi Ulnaris
Extends and adducts hand at the wrist joint
