Forearm Muscles AOINS & Complete Anatomy Pictures

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 Pollicis Longus Origin

Anterior surface of radius and adjacent interosseous membrane of forearm

Pronator Quadratus Origin

Anterior aspect of distal 1/4 of ulna

Flexor carpi Ulnaris Origin

Medial epicondyle of humerus

Pronator Teres Origin

Medial supracondylar ridge of humerus (humeral head)

Flexor Carpi Radialis Origin

Medial epicondyle of humerus

Palmaris Longus Origin

Medial epicondyle of humerus

Flexor digitorum Superficialis Origin

Medial epicondyle of humerus

Anconeus Origin

Posterior aspect of lateral epicondyle of humerus

Brachioradialis Origin

Superior 2/3 of lateral supracondylar ridge of humerus

Extensor Carpi Radialis Longus Origin

Inferior 1/3 of lateral supracondylar ridge of humerus

Extensor Carpi Radialis Brevis Origin

Lateral epicondyle of humerus

Extensor digitorum Origin

Lateral epicondyle of humerus

Extensor digiti minimi Origin

Lateral epicondyle of humerus

Extensor Carpi Ulnaris Origin

Lateral epicondyle of humerus

Abductor pollicis longus Origin

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

Extensor pollicis Longus Origin

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

Extensor pollicis brevis Origin

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

Extensor Indicis Origin

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

Supinator Origin

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

Abductor pollicis brevis Origin

Tubercles of scaphoid and trapezium bones, flexor retinaculum of hand

Flexor pollicis brevis Origin

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

Opponens pollicis Origin

Tubercle of trapezium bone and flexor retinaculum of hand

Adductor pollicis transverse head Origin

Palmar aspect of body of 3rd metacarpal bone

Adductor pollicis oblique head Origin

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

Abductor digiti minimi Origin

Pisiform bone and tendon of flexor carpi ulnaris

Flexor digiti minimi brevis Origin

Hook of hamate bone and flexor retinaculum of hand

Opponens digiti minimi Origin

Hook of hamate bone and flexor retinaculum of hand

Lumbricals Origin

Tendons of flexor digitorum profundus

Dorsal interossei Origin

Adjacent sides of metacarpals

Palmar interossei Origin

Sides of metacarpals

Extensor expansion lateral bands Origin

Near the proximal interphalangeal joint

Extensor expansion middle slip Origin

Near the proximal interphalangeal joint

Extensor expansion hood Origin

Proximal phalanges

Flexor Digitorum Profundus Insertion

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

Flexor Pollicis Longus Insertion

Palmar aspect of base of distal phalanx of thumb

Pronator Quadratus Insertion

Anterior aspect of distal 1/4 of radius

Flexor carpi Ulnaris Insertion

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

Pronator Teres Insertion

Middle 1/3 of anterolateral aspect of radius

Flexor Carpi Radialis Insertion

Palmar aspects of bases of 2&3 metacarpal bones

Palmaris Longus Insertion

Palmar aponeurosis and flexor retinaculum of hand

Flexor digitorum Superficialis Insertion

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

Anconeus Insertion

Olecranon; proximal end of body of ulna

Brachioradialis Insertion

Lateral aspect of distal radius

Extensor Carpi Radialis Longus Insertion

Dorsal aspect of base of second metacarpal

Extensor Carpi Radialis Brevis Insertion

Dorsal aspect of base of third metacarpal bone

Extensor digitorum Insertion

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

Extensor digiti minimi Insertion

Extensor expansion of little finger

Extensor Carpi Ulnaris Insertion

Medial aspect of base of fifth metacarpal bone

Abductor pollicis longus Insertion

Lateral aspect of base of 1st metacarpal bone

Extensor pollicis Longus Insertion

Dorsal aspect of base of distal phalanx of thumb

Extensor pollicis brevis Insertion

Dorsal aspect of base of proximal phalanx of thumb

Extensor Indicis Insertion

Extensor expansion of index finger

Supinator Insertion

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

Abductor pollicis brevis Insertion

Lateral aspect of base of proximal phalanx of thumb

Flexor pollicis brevis Insertion

Lateral aspect of base of proximal phalanx of thumb

Opponens pollicis Insertion

Anterolateral aspect of body of 1st metacarpal bone

Adductor pollicis transverse head Insertion

Medial aspect of base of proximal phalanx of thumb

Adductor pollicis oblique head Insertion

Medial aspect of base of proximal phalanx of thumb

Abductor digiti minimi Insertion

Medial aspect of base of proximal phalanx of little finger

Flexor digiti minimi brevis Insertion

Medial aspect of base of proximal phalanx of little finger

Opponens digiti minimi Insertion

Medial aspect of fifth metacarpal bone

Lumbricals Insertion

Extensor hoods of 2-5 digits

Dorsal interossei Insertion

Extensor hood and base of proximal phalanges of index, middle, and ring fingers

Palmar interossei Insertion

Extensor hoods of thumb, index, ring and little fingers and the proximal phalax of thumb

Extensor expansion lateral bands Insertion

Distal phalanx

Extensor expansion middle slip Insertion

Middle phalanx

Extensor expansion hood Insertion

Attaches to muscles

Flexor Digitorum Profundus Action

Flexes digits 2-5

Flexor Pollicis Longus Action

Flexes thumb

Pronator Quadratus Action

Pronates forearm at radioulnar joint

Flexor carpi Ulnaris Action

Flexes and adducts hand at radiocarpal joint

Pronator Teres Action

Pronates forearm at radioulnar joint

Flexor Carpi Radialis Action

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

Palmaris Longus Action

Flexes hand at radiocarpal joint; stablizes palmar aponeurosis

Flexor digitorum Superficialis Action

Flexes digits 2-5

Anconeus Action

Extends forearm at elbow joint

Brachioradialis Action

Flexes forearm at elbow joint

Extensor Carpi Radialis Longus Action

Extends and abducts hand at radiocarpal and midcarpal joints

Extensor Carpi Radialis Brevis Action

Extends hand and abducts hand at radiocarpal and midcarpal joints

Extensor digitorum Action

Extends digits 2-5

Extensor digiti minimi Action

Extends little finger

Extensor Carpi Ulnaris Action

Extends and adducts hand at radiocarpal joint

Abductor pollicis longus Action

Abducts and extends thumb at 1st carpometacarpal joint

Extensor pollicis Longus Action

Extends the thumb

Extensor pollicis brevis Action

Extends the thumb

Extensor Indicis Action

Extends the index finger

Supinator Action

Supinates forearm at radioulnar joint

Abductor pollicis brevis Action

Abducts thumb at its carpometacarpal joint

Flexor pollicis brevis Action

Flexes thumb

Opponens pollicis Action

Opposes thumb towards other fingers

Adductor pollicis transverse head Action

Adducts thumb at its carpometacarpal joints

Adductor pollicis oblique head Action

Adducts the thumb at its carpometacarpal joint

Abductor digiti minimi Action

Abducts little finger at its metacarpohalangeal joint

Flexor digiti minimi brevis Action

Flexes little finger at its metacarpophalangeal joint

Opponens digiti minimi Action

Opposes little finger towards thumb

Lumbricals Action

Flex metacarpal joints while extending interphalangeal joints

Dorsal interossei Action

Abduction of index, middle, and ring fingers at the metacarpophalangeal joints

Palmar interossei Action

Adduction of thumb index ring and little fingers at the metacarpophalangeal joints

Flexor Digitorum Profundus Innervation

Medial part: ulnar nerve

Lateral part: anterior interosseous branch of median nerve