Forearm Muscles OIANs

Flexor digitorum profundus origin

Medial aspect of coronoid process of ulna and superior 3/4 of anterior and medial surfaces of body of ulna

Flexor digitorum profundus insertion

Palmar aspects of bases of the distal phalanges of digits 2-5

Flexor digitorum profundus action

Flexes digits 2-5

Flexor digitorum profundus nerve

Medial part: ulnar nerve Lateral part: anterior interosseous branch of median nerve

Flexor pollicis longus origin

Anterior surface of radius and adjacent interosseous membrane of forearm

Flexor pollicis longus insertion

Palmar aspect of base of distal phalanx of thumb

Flexor pollicis longus action

Flexes thumb

Flexor pollicis longus nerve

Anterior interosseous nerve

Pronator Quadratus origin

Anterior aspect of distal 1/4 of ulna

Pronator Quadratus insertion

Anterior aspect of distal 1/4 of radius

pronator quadratus action

Pronates forearm at radioulnar joint

pronator quadratus nerve

Anterior interosseous nerve

Flexor carpi ulnaris origin

Medial epicondyle of humerus

Flexor carpi ulnaris insertion

Pisiform, hook of hamate, and palmar aspect of base of 5th metacarpal bone

Flexor carpi ulnaris action

Flexes and adducts hand at radiocarpal joint

Flexor carpi ulnaris nerve

Ulnar nerve

Pronator teres origin

Medial supracondylar ridge of humerus  (humeral head)

Pronator teres insertion

Middle 1/3 of anterolateral aspect of radius

pronator teres action

Pronates forearm at radioulnar joint

pronator teres nerve

median nerve

flexor carpi radialis origin

Medial epicondyle of humerus

Flexor carpi radialis insertion

Palmar aspects of bases of 2&3 metacarpal bones

FLe

Flexor carpi radialis action

Flexes hand at radiocarpal joint; abducts hand at radiocarpal and midcarpal joints

Flexor carpi radialis nerve

Median nerve

Palmaris longues origin

Medial epicondyle of humerus

Palmaris longus insertion

Palmar aponeurosis and flexor retinaculum of hand

Palmaris longus action

Flexes hand at radiocarpal joint; stablizes palmar aponeurosis

Palmaris longus nerve

Median nerve

Flexor digitorum superficialis origin

Medial epicondyle of humerus

Flexor digitorum superficialis insertion

Palmar aspects of the bodies of middle phalanges of digits 2-5

Flexor digitorum superficialis action

Flexes digits 2-5

Flexor digitorum superficialis nerve

Median nerve

Anconeus origin

Posterior aspect of lateral epicondyle of humerus

Anconeus insertion

Olecranon; proximal end of body of ulna

An

Anconeus action

Extends forearm at elbow joint

Anconeus nerve

Radial nerve

Brachioradialis origin

Superior 2/3 of lateral supracondylar ridge of humerus

Brachioradialis insertion

Lateral aspect of distal radius

Brachioradialis action

Flexes forearm at elbow joint

Brachioradialis nerve

Radial nerve

Extensor carpi radialis longus origin

Inferior 1/3 of lateral supracondylar ridge of humerus

Extensor carpi radialis longus insertion

Dorsal aspect of base of second metacarpal

Extensor carpi radialis longus action

Extends and abducts hand at radiocarpal and midcarpal joints

Extensor carpi radialis longus nerve

Radial nerve

Extensor carpi radialis brevis origin

Lateral epicondyle of humerus

Extensor carpi radialis brevis insertion

Dorsal aspect of base of third metacarpal bone

Extensor carpi radialis brevis action

Extends hand and abducts hand at radiocarpal and midcarpal joints

Extensor carpi radialis brevis nerve

Deep branch of radial nerve and posterior interosseous nerve

Extensor digitorum origin

Lateral epicondyle of humerus

E

Extensor digitorum insertion

Dorsal aspects of bases of both middle and distal phalanges of digits 2-5

Extensor digitorum action

Extends digits 2-5

Extensor digitorum nerve

Posterior interosseous nerve

Extensor digiti minimi origin

Lateral epicondyle of humerus

Extensor digiti minimi insertion

Extensor expansion of little finger

Extensor digiti minimi action

Extends little finger

Extensor digiti minimi nerve

Posterior interosseous nerve

Extensor carpi ulnaris origin

Lateral epicondyle of humerus

Extensor carpi ulnaris insertion

Medial aspect of base of fifth metacarpal bone

Extensor carpi ulnaris action

Extends and adducts hand at radiocarpal joint

Extensor carpi ulnaris nerve

Posterior interosseous nerve

Abductor pollicis longus origin

Posterior aspects of proximal 1/2 of ulna and middle 1/3  of radius; interosseous membrane of forearm

Abductor pollicis longus insertion

Lateral aspect of base of 1st metacarpal bone

Ab

Abductor pollicis longus action

Abducts and extends thumb at 1st carpometacarpal joint

Abductor pollicis longus nerve

Posterior interosseous nerve

Extensor pollicis longus origin

Posterior surface of middle 1/3  of unla; adjacent interosseous membrane of forearm

Extensor pollicis longus insertion

Dorsal aspect of base of distal phalanx of thumb

Extensor pollicis longus action

Extends the thumb

Extensor pollicis longus nerve

Posterior interosseous nerve

Extensor pollicis brevis origin

Posterior surface of distal 1/2 of radius;  interosseous membrane of the forearm

Extensor pollicis brevis insertion

Dorsal aspect of base of proximal phalanx of thumb

Extensor pollis brevis action

Extends the thumb

E

Extensor pollicis brevis nerve

Posterior interosseous nerve

Extensor indicis origin

Posterior surface of distal 1/3 of ulna; interosseous membrane of forearm

Extensor indicis insertion

Extensor expansion of index finger

Extensor indicis action

Extends the index finger

Extensor indicis nerve

Posterior interosseous nerve

Supinator origin

Lateral epicondyle of humerus, supinator crest and supinator fossa of ulna.

SUp

Supinator insertion

Anterior, lateral , and posterior aspects of proximal 1/3 of radius

Supinator action

Supinates forearm at radioulnar joint

Supinator nerve

Posterior interosseous nerve

Abductor pollicis brevis origin

Tubercles of scaphoid and trapezium bones, flexor retinaculum of hand

Abductor pollicis brevis insertion

Lateral aspect of base of proximal phalanx of thumb

Abductor pollicis brevis action

Abducts thumb at its carpometacarpal joint

Abductor pollicis brevis nerve

Recurrent branch of median nerve

Flexor pollicis brevis origin

Tubercle of trapezium bone, palmar aspects of capitate and trapezoid bone, flexor retinaculum of hand

Flexor pollicis brevis insertion

Lateral aspect of base of proximal phalanx of thmb

F

Flexor pollicis brevis action

Flexes thumb

Flexor pollicis brevis nerve

Superficial head: recurrent branch of median nerve; deep head: deep branch of ulnar nerve

Opponens pollicis origin

Tubercle of trapezium bone and flexor retinaculum of hand

Opponens pollicis insertion

Anterolateral aspect of body of 1st metacarpal bone

Opponens pollicis action

Opposes thumb towards other fingers

Opponens pollicis nerve

Recurrent branch of median nerve

Adductor pollicis transverse head origin

Palmar aspect of body of 3rd metacarpal bone

Adductor pollicis transverse head insertion

Medial aspect of base of proximal phalanx of thumb

Adductor pollicis transverse head action

Adducts thumb at its carpometacarpal joints

Adductor pollicis transverese head nerve

Deep branch of ulnar nerve

Adductor pollicis oblique head origin

Palmar aspects of capitate bone and bases of 2&3 metacarpal bones

Adductor pollicis oblique head insertion

Medial aspect of base of proximal phalanx of thumb

Adductor pollicis oblique head action

Adducts the thumb at its carpometacarpal joint

Adductor pollicis oblique head nerve

Deep branch of ulnar nerve