Shoulder Girdle Muscles Instertions Actions & Origins
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| What is the origin of Trapezius | Upper Fibers: Occipital Protuberance, Middle Fibers: Spinous Processes of C7-T3, Lower Fibers: Spinous Processes of T4-12
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| What is the insertion of Trapezius | Upper Fibers: Posterior lateral third of the Clavicle, Middle Fibers: Medial Acromion process and superior scapular spine, Lower Fibers: Inferior medial scapular spine
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| What is the action of Trapezius | Upper Fibers: elevation and cervical extension, Middle Fibers: elevation, upward rotation and retraction, Lower Fibers: depression, upward rotation and retraction
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| What is the origin of Levator Scapulae | Transverse process of C1-4
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| What is the insertion of Levator Scapulae | Medial border of scapular superior to scapular spine
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| What is the action of Levator Scapulae | Elevation
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| What is the origin of Rhomboid | Spinous processes of C7-T5
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| What is the insertion of Rhomboid | Medial border of the scapular, inferior to spine
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| What is the action of Rhomboid | Retraction and downward rotation
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| What is the origin of Serratus Anterior | Lateral surface of ribs 1-9
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| What is the insertion of Serratus Anterior | Anterior aspect of length of medial border of scapula
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| What is the action of Serratus Anterior | Protraction
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| What is the origin of Pectoralis Minor | Anterior surfaces of ribs 3-5
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| What is the insertion of Pectoralis Minor | Coracoid Process
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| What is the action of Pectoralis Minor | Protraction
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| What is the origin of Deltiod | Aneterior Fibers: Anterior lateral third of clavicle, Middle Fibers: lateral aspect of acromion, Posterior Fibers: inferior edge of spine of scapula
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| What is the insertion of Deltoid | Deltoid Tuberosity
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| What is the action of Deltoid | Anterior Fibers: shoulder abduction, flexion, horizone adduction and internal rotation, Middle Fibers: shoulder abduction, Posterior Fibers: shoulder abduction, extension, horizontal abduction and external rotation
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| What is the action of Pectoralis Major | Upper Fibers: (clavicular head) medial 1/2 of anterior clavicle, Lower Fibers: (sternal head) anterior costal cartilage of ribs 1-6 and adjoining sternum
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| What is the insertion of Pectoralis Major | Later lip of bicipital groove
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| What is the action of Pectoralis Major | Upper Fibers: shoulder internal rotation, horizontal adduction, flexion, Lower Fibers: shoulder internal rotation, horizontal adduction, extension and adduction
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| What is the origin of Coracobrachialis | Coracoid process
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| What is the insertion of Coracobrachialis | Middle of medial border of humeral shaft
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| What is the action of Coracobrachialis | Shoulder flexion, shoulder adduction, horizontal adduction
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| What is the origin of Subscapularis | Entire anterior surface of subscapular fossa
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| What is the insertion of Subscapularis | Lesser tubercle of humerus
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| What is the action of Subscapularis | Shoulder internal rotation, shoulder adduction
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| What is the origin of Supraspinatus | Supraspinatus fossa
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| What is the insertion of Supraspinatus | Superiorly on the greater tubercle of humerus
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| What is the action of Superspinatus | Weak shoulder abduction
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| What is the origin of Infraspinatus | Medial aspect of infraspinatus fossa
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| What is the insertion of Infraspinatus | Posteriorly on the greater tubercle of humerus
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| What is the action of Infraspinatus | Shoulder external rotation, shoulder horizontal abduction
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| What is the origin of Teres Minor | Posteriorly on superior 2/3 of lateral border of scapula
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| What is the insertion of Teres Minor | Posteriorly on greater tubercle of humerus
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| What is the action of Teres Minor | Shoulder external rotation, and shoulder horizontal abduction
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| What is the origin of Teres Major | Posteriorly on the inferior 1/3 of lateral border of scapula
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| What is the insertion of Teres Major | Medial lip of bicipital groove
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| What is the action of Teres Major | Shoulder extension, internal rotation and adduction
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| What is the origin of Biceps Brachii | Long Head: supraglenoid tubercle (above superior lip of glenoid fossa), Short Head: coracoid process
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| What is the Insertion of Biceps Brachii | Radial tuberosity
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| What is the action of Biceps Brachii | Elbow flexion, supination, shoulder flexion
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| What is the origin of Brachialis | Distal half of anterior humerus
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| What is the insertion of Brachialis | Coronoid process of ulna
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| What is the action of Brachialis | Elbow flexion
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| What is the origin of Brachioradialus | Distal 2/3 of lateral condyloid ridge of humerus
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| What is the insertion of Brachioradialus | Lateral radial styloid process
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| What is the action of Brachioradialus | Elbow flexion, pronation from supinated position to neutral, supination from pronated position to neutral
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| What is the origin of Triceps Brachii | Long Head: infraglenoid tubercle (below inferior lip of glenoid fossa), Lateral Head: proximal half of posterior humerus, Medial Head: Distal 2/3 of posterior humerus
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| What is the insertion of Triceps Brachii | Olecranon process
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| What is the action of Triceps Brachii | All heads: elbow extension, long head: shoulder extension
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| What is the origin of Pronator Teres | Distal, Medial condyloid ridge of humerus and medial proximal ulna
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| What is the insertion of Pronator Teres | Middle 1/3 of lateral radius
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| What is the action of Pronator Teres | Pronation
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| What is the origin of Supinator | Lateral epicondyle and neighboring posterior ulna
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| What is the insertion of Supinator | Lateral, proximal radius just distal to head
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| What is the action of Supinator | Supination
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| What is the origin of Flexor Carpi Radialis | Medial Epicondyle
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| What is the insertion of Flexor Carpi Radialis | Proximal metacarpals 2-3 (Palmar Surface)
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| What is the action of Flexor Carpi Radialis | Wrist flexion, radial deviation
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| What is the origin of Palmaris Longus | Medial Eopicondyle
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| What is the insertion of Palmaris Longus | Palmar aponeurosis of metacarpals 2-5
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| What is the action of Palmaris Longus | Wrist flexion
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| What is the origin of Flexor Carpi Ulnaris | Medial epicondyle, and posterior proximal ulna
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| What is the insertion of Flexor Carpi Ulnaris | Pisiform, hamate and proximal 5th metacarpal (palmer surface)
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| What is the action of Flexor Carpi Ulnaris | Wrist Flexion and ulnar deviation
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| What is the origin of Extensor Carpi Ulnaris | Lateral epicondyle, middle 2/4 of posterior border of ulna
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| What is the insertion of Extensor Carpi Ulnaris | Proximal 5th metacarpal (dorsal surface)
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| What is the action of Extensor Carpi Ulnaris | Wrist extension, ulnar deviation
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| What is the origin of Extensor Carpi Radialis Brevis | Lateral epicondyle
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| What is the insertion of Extensor Carpi Radialis Brevis | Proximal 3rd metacarpal (dorsal surface)
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| What is the action of Extensor Carpi Radialis Brevis | Wrist extension, radial deviation
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| What is the origin of Extensor Carpi Radialis Longus | Distal 1/3 of lateral condyloid ridge of humerus and lateral epicondyle
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| What is the insertion of Extensor Carpi Radialis Longus | Proximal 2nd metacarpal (dorsal surface)
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| What is the action of Extensor Carpi Radialis Longus | Wrist extension, and radial deviation
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| What is the origin of Flexor Digitorum Superficials | Medial epicondyle, medial coronoid process, proximal 2/3 of anterior radius
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| What is the insertion of Flexor Digitorum Superficials | Tendon splits and attatches to sides of middle phalanx of 4 fingers (palmar surface)
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| What is the action of Flexor Digitorum Superficials | Flexion at MCP and POP joints 2-5, wrist flexion
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| What is the origin of Flexor Digitorum Profundus | Proximal 3/4 of anterior medial ulna
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| What is the insertion of Flexor Digitorum Profundus | Proximal end of distal phalanx of 4 fingers (palmar surface)
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| What is the action of Flexor Digitorum Profundus | Flexion of MCP, PIP and DIP joints 2-5, wrist flexion
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| What is the origin of Flexor Pollicis Longus | Middle anterior surface of radius and anterior medial ulna just distal to coronoid process
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| What is the insertion of Flexor Pollicis Longus | Proximal end of distal phalanx of thumb (palmar surface)
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| What is the action of Flexor Pollicis Longus | Flexion of 1st carpometacarpal, MCP, and IP joint, wrist flexion
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| What is the origin of Extensor Digitorum | Lateral Epicondyle
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| What is the insertion of Extensor Digitorum | 4 tendons to proximal end of middle distal phalanges of 4 fingers (dorsal surface)
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| What is the action of Extensor Digitorum | Extension of MCP joints 2-5 and wrist extension
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| What is the origin of Extensor Pollicis Longus | Posterior surface of distal/medial ulna
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| What is the insertion of Extensor Pollicis Longus | Proximal end of distal phalanx of thumb (dorsal)
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| What is the action of Extensor Pollicis Longus | Extension of 1st MCP and IP joints, wrist extension
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| What is the origin of Extensor Pollicis Brevis | Posterior surface of lower/middle radius
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| What is the insertion of Extensor Pollicis Brevis | Proximal end of proximal phalanx of thumb (dorsal surface)
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| What is the action of Extensor Pollicis Brevis | Extension of 1st MCP joint
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| What is the origin of Abductor Pollicis Longus | Posterior aspect of radius and midshaft of ulna
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| What is the insertion of Abductor Pollicis Longus | Proximal 1st metacarpal (dorsal surface)
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| What is the action of Abductor Pollicis Longus | Abduction 1st carpometacarpal joint, radial deviation
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