| A | B |
|---|
| Abductor Digiti Minimi Origin | Pisiform |
| Abductor Digiti Minimi Insertion | Medial side of base of proximal phalanx of little finger |
| Abductor Digiti Minimi Action | Abducts little (5th) finger |
| Abductor Digiti Minimi Innervation | Deep branch of ulnar nerve (C8 and T1) (C8, T1) |
| Abductor Digiti Minimi Arterial Supply | Ulnar artery |
| Abductor Pollicis Brevis Origin | Flexor retinaculum and tubercles of scaphoid and trapezium |
| Abductor Pollicis Brevis Insertion | Lateral side of base of proximal phalanx of thumb |
| Abductor Pollicis Brevis Action | Abducts thumb and helps oppose it |
| Abductor Pollicis Brevis Innervation | Recurrent branch of median nerve (C8 and T1) (C8, T1) |
| Abductor Pollicis Brevis Arterial Supply | Superficial palmar branch of the radial artery |
| Abductor Pollicis Longus Origin | Posterior surfaces of ulna, radius and interosseous membrane |
| Abductor Pollicis Longus Insertion | Base of 1st metacarpal |
| Abductor Pollicis Longus Action | Abducts thumb and extends it at carpometacarpal joint |
| Abductor Pollicis Longus Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Abductor Pollicis Longus Arterial Supply | Posterior interosseous artery |
| Abductor Pollicis Origin | Oblique head: bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals; Transverse head: anterior surface of body of 3rd metacarpal |
| Abductor Pollicis Insertion | Medial side of base of proximal phalanx of thumb |
| Abductor Pollicis Action | Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially |
| Abductor Pollicis Innervation | Deep branch of ulnar nerve (C8 and T1) (C8, T1) |
| Abductor Pollicis Arterial Supply | Deep palmar arterial arch |
| Aconeus Origin | Lateral epicondyle of humerus |
| Aconeus Insertion | Lateral surface of olecranon and superior part of posterior surface of ulna |
| Aconeus Action | Assists triceps in extending forearm; stabilizes elbow joint; abducts ulna during pronation |
| Aconeus Innervation | Radial nerve (C7, C8 and T1) (C7, C8, T1) |
| Aconeus Arterial Supply | Middle collateral branch of deep brachial artery; Recurrent interosseous artery |
| Biceps Brachii Origin | Short head: tip of coracoid process of scapula; Long head: supraglenoid tubercle of scapula |
| Biceps Brachii Insertion | Tuberosity of radius and fascia of forearm via bicipital aponeurosis |
| Biceps Brachii Action | Supinates forearm and, when it is supine, flexes forearm |
| Biceps Brachii Innervation | Musculocutaneous nerve (C5 and C6 ) (C5, C6) |
| Biceps Brachii Arterial Supply | Muscular branches of brachial artery |
| Brachialis Origin | Distal half of anterior surface of humerus |
| Brachialis Insertion | Coronoid process and tuberosity of ulna |
| Brachialis Action | Major flexor of forearm -- flexes forearm in all positions |
| Brachialis Innervation | Musculocutaneous nerve (C5 and C6) (C5, C6) |
| Brachialis Arterial Supply | Muscular branches of brachial artery, recurrent radial artery |
| BrachioradialisOrigin | Proximal 2/3 of lateral supracondyle ridge of humerus |
| Brachioradialis Insertion | Lateral surface of distal end of radius |
| Brachioradialis Action | Flexes forearm |
| Brachioradialis Innervation | Radial nerve (C5, C6 and C7) (C5, C6, C7) |
| Brachioradialis Arterial Supply | Radial recurrent artery |
| Coracobrachialis Origin | Tip of coracoid process of scapula |
| Coracobrachialis Insertion | Middle third of medial surface of humerus |
| Coracobrachialis Action | Helps to flex and adduct arm |
| Coracobrachialis Innervation | Musculocutaneous nerve (C5, C6 and C7) (C5, C6, C7) |
| Coracobrachialis Arterial Supply | Muscular branches of brachial artery |
| Deltoid origin | Lateral third of clavicle, acromion, and spine of scapula |
| Deltoid Insertion | Deltoid tuberosity of humerus |
| Deltoid Action | Anterior part: flexes and medially rotates arm; Middle part: abducts arm; Posterior part: extends and laterally rotates arm |
| Deltoid Innervation | Axillary nerve (C5 and C6) (C5, C6) |
| Deltoid Arterial Supply | Deltoid branch of thoracoacromial artery |
| Extensor Carpi Radialis Brevis Origin | Lateral epicondyle of humerus |
| Extensor Carpi Radialis Brevis Insertion | Base of 3rd metacarpal |
| Extensor Carpi Radialis Brevis Action | Extend and abduct hand at wrist joint |
| Extensor Carpi Radialis Brevis Innervation | Deep branch of radial nerve (C7 and C8) (C7, C8) |
| Extensor Carpi Radialis Brevis Arterial Supply | Radial artery |
| Extensor Carpi Radialis Longus Origin | Lateral supracondyle ridge of humerus |
| Extensor Carpi Radialis Longus Insertion | Base of 2nd metacarpal |
| Extensor Carpi Radialis Longus Action | Extend and abduct hand at wrist joint |
| Extensor Carpi Radialis Longus Innervation | Radial nerve (C6 and C7) (C6, C7) |
| Extensor Carpi Radialis Longus Arterial Supply | Radial artery |
| Extensor Carpi Ulnaris Origin | Lateral epicondyle of humerus and posterior border of ulna |
| Extensor Carpi Ulnaris Insertion | Base of 5th metacarpal |
| Extensor Carpi Ulnaris Action | Extends and adducts hand at wrist joint |
| Extensor Carpi Ulnaris Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Extensor Carpi Ulnaris Arterial Supply | Ulnar artery |
| Extensor Digiti Minimi Origin | Lateral epicondyle of humerus |
| Extensor Digiti Minimi Insertion | Extensor expansion of 5th digit |
| Extensor Digiti Minimi Action | Extends 5th digit at metacarpophalangeal and interphalangeal joints |
| Extensor Digiti Minimi Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Extensor Digiti Minimi Arterial Supply | Interosseous recurrent artery |
| Extensor Digitorum Origin | Lateral epicondyle of humerus |
| Extensor Digitorum Insertion | Extensor expansions of medial four digits |
| Extensor Digitorum Action | Extends medial four digits at metacarpophalangeal joints; Extends hand at wrist joint |
| Extensor Digitorum Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Extensor Digitorum Arterial Supply | Interosseous recurrent and posterior interosseous arteries |
| Extensor Indicis Origin | Posterior surface of ulna and interosseous membrane |
| Extensor Indicis Insertion | Extensor expansion of 2nd digit |
| Extensor Indicis Action | Extends 2nd digit and helps to extend hand |
| Extensor Indicis Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Extensor Indicis Arterial Supply | Posterior interosseous artery |
| Extensor Pollicis Brevis Origin | Posterior surfaces of radius and interosseous membrane |
| Extensor Pollicis Brevis Insertion | Base of proximal phalanx of thumb |
| Extensor Pollicis Brevis Action | Extends proximal phalanx of thumb at carpometacarpal joint |
| Extensor Pollicis Brevis Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Extensor Pollicis Brevis Arterial Supply | Posterior interosseous artery |
| Extensor Pollicis Longus Origin | Posterior surface of middle 1/3 of ulna and interosseous membrane |
| Extensor Pollicis Longus Insertion | Base of distal phalanx of thumb |
| Extensor Pollicis Longus Action | Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints |
| Extensor Pollicis Longus Innervation | Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8) |
| Extensor Pollicis Longus Arterial Supply | Posterior interosseous artery |
| Flexor Carpi Radialis Origin | Medial epicondyle of humerus |
| Flexor Carpi Radialis Insertion | Base of 2nd metacarpal |
| Flexor Carpi Radialis Action | Flexes and abducts hand (at wrist) |
| Flexor Carpi Radialis Innervation | Median nerve (C6 and C7) (C6, C7) |
| Flexor Carpi Radialis Arterial Supply | Ulnar artery |
| Flexor Carpi Ulnaris Origin | Humeral head: medial epicondyle of humerus; Ulnar head: olecranon and posterior border of ulna |
| Flexor Carpi Ulnaris Insertion | Pisiform bone, hook of hamate bone, and 5th metacarpal bone |
| Flexor Carpi Ulnaris Action | Flexes and adducts hand (at wrist) |
| Flexor Carpi Ulnaris Innervation | Ulnar nerve (C7 and C8) (C7, C8) |
| Flexor Carpi Ulnaris Arterial Supply | Ulnar artery |
| Flexor Digitorum Profundus Origin | Proximal 3/4 of medial and anterior surfaces of ulna and interosseous membrane |
| Flexor Digitorum Profundus Insertion | Base of the distal phalanx of digits 2 - 5 |
| Flexor Digitorum Profundus Action | Flexes distal phalanges at distal interphalangeal joints of medial four digits; assists with flexion of hand |
| Flexor Digitorum Profundus Innervation | Medial part: ulnar nerve (C8 and T1); Lateral part: anterior interosseous branch of median nerve (C8 and T1) (C8, T1) |
| Flexor Digitorum Profundus Arterial Supply | Ulnar and anterior interosseous arteries |
| Flexor Digiti Minimi Brevis Origin | Hook of hamate and flexor retinaculum |
| Flexor Digiti Minimi Brevis Insertion | Medial side of base of proximal phalanx of little finger |
| Flexor Digiti Minimi Brevis Action | Flexes proximal phalanx of little (5th) finger |
| Flexor Digiti Minimi Brevis Innervation | Deep branch of ulnar nerve (C8 and T1) (C8, T1) |
| Flexor Digiti Minimi Brevis Arterial Supply | Ulnar artery |
| Flexor Digitorum Superficialis Origin | Humeroulnar head: medial epicondyle of humerus, ulnar collateral ligament, and coronoid process of ulna; Radial head: superior half of anterior border of radius |
| Flexor Digitorum Superficialis Insertion | Bodies of middle phalanges of digits 2 - 5 |
| Flexor Digitorum Superficialis Action | Flexes middle phalanges at proximal interphalangeal joints of medial four digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints and hand |
| Flexor Digitorum Superficialis Innervation | Median nerve (C7, C8 and T1) (C7, C8, T1) |
| Flexor Digitorum Superficialis Arterial Supply | Ulnar artery |
| Flexor Pollicis Brevis Origin | Flexor retinaculum and tubercles of scaphoid and trapezium |
| Flexor Pollicis Brevis Insertion | Lateral side of base of proximal phalanx of thumb |
| Flexor Pollicis Brevis Action | Flexes thumb |
| Flexor Pollicis Brevis Innervation | Recurrent branch of median nerve (C8 and T1) (C8, T1) |
| Flexor Pollicis Brevis Arterial Supply | Superficial palmar branch of the radial artery |
| Flexor Pollicis Longus Origin | Anterior surface of radius and adjacent interosseous membrane |
| Flexor Pollicis Longus Insertion | Base of distal phalanx of thumb |
| Flexor Pollicis Longus Action | Flexes phalanges of 1st digit (thumb) |
| Flexor Pollicis Longus Innervation | Anterior interosseous nerve from median nerve (C8 and T1) (C8, T1) |
| Flexor Pollicis Longus Arterial Supply | Anterior interosseous artery |
| Interosseous Muscles, Dorsal Origin | Adjacent sides of two metacarpals (bipennate muscles) |
| Interosseous Muscles, Dorsal Insertion | Extensor expansions and bases of proximal phalanges of digits 2 - 4 |
| Interosseous Muscles, Dorsal Action | Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints |
| Interosseous Muscles, Dorsal Innervation | Deep branch of ulnar nerve (C8 and T1) (C8, T1) |
| Interosseous Muscles, Dorsal Arterial Supply | Dorsal and palmar metacarpal arteries |
| Interosseous Muscles, Palmar Origin | Palmar surfaces of 2nd, 4th and 5th metacarpals (unipennate muscles) |
| Interosseous Muscles, Palmar Insertion | Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5 |
| Interosseous Muscles, Palmar Action | Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints |
| Interosseous Muscles, Palmar Innervation | Deep branch of ulnar nerve (C8 and T1) (C8, T1) |
| Interosseous Muscles, Palmar Arterial Supply | Palmar metacarpal arteries |
| Opponens Digiti Minimi Origin | Hook of hamate and flexor retinaculum |
| Opponens Digiti Minimi Insertion | Medial border of 5th metacarpal |
| Opponens Digiti Minimi Action | Draws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumb |
| Opponens Digiti Minimi Innervation | Deep branch of ulnar nerve (C8 and T1) (C8, T1) |
| Opponens Digiti Minimi Arterial Supply | Ulnar artery |
| Opponens Pollicis Origin | Flexor retinaculum and tubercles of scaphoid and trapezium |
| Opponens Pollicis Insertion | Lateral side of 1st metacarpal |
| Opponens Pollicis Action | Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially |
| Opponens Pollicis Innervation | Recurrent branch of median nerve (C8 and T1) (C8, T1) |
| Opponens Pollicis Arterial Supply | Superficial palmar branch of the radial artery |
| Palmaris Longus Origin | Medial epicondyle of humerus |
| Palmaris Longus Insertion | Distal half of flexor retinaculum and palmar aponeurosis |
| Palmaris Longus Action | Flexes hand (at wrist) and tightens palmar aponeurosis |
| Palmaris Longus Innervation | Median nerve (C7 and C8) (C7, C8) |
| Palmaris Longus Arterial Supply | Ulnar artery |
| Pronator Quadratus Origin | Distal 1/4 of anterior surface of ulna |
| Pronator Quadratus Insertion | Distal 1/4 of anterior surface of radius |
| Pronator Quadratus Action | Pronates forearm; deep fibers bind radius and ulna together |
| Pronator Quadratus Innervation | Anterior interosseous nerve from median nerve (C8 and T1) (C8, T1) |
| Pronator Quadratus Arterial Supply | Anterior interosseous artery |
| Pronator Teres Origin | Medial epicondyle of humerus and coronoid process of ulna |
| Pronator Teres Insertion | Middle of lateral surface of radius |
| Pronator Teres Action | Pronates and flexes forearm (at elbow) |
| Pronator Teres Innervation | Median nerve (C6 and C7) (C6, C7) |
| Pronator Teres Arterial Supply | Ulnar artery, anterior recurrent ulnar artery |
| SupinatorOrigin | Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa and crest of ulna |
| Supinator Insertion | Lateral, posterior and anterior surfaces of proximal 1/3 of radius |
| Supinator Action | Supinates forearm (i.e., rotates radius to turn palm anteriorly) |
| Supinator Innervation | Deep branch of radial nerve (C5 and C6) (C5, C6) |
| Supinator Arterial Supply | Recurrent interosseous artery |
| Triceps Brachii Origin | Long head: infraglenoid tubercle of scapula; Lateral head: posterior surface of humerus, superior to radial groove; Medial head: posterior surface of humerus, inferior to radial groove |
| Triceps Brachii Insertion | Proximal end of olecranon process of ulna and fascia of forearm |
| Triceps Brachii Action | Chief extensor of forearm; long head steadies head of abducted humerus |
| Triceps Brachii Innervation | Radial nerve (C6, C7 and C8) (C6, C7, C8) |
| Triceps Brachii Arterial Supply | Branches of deep brachial artery |
