Forearm

Bones

Lateral epicondyle

Olecranon

Medial epicondyle

Ulna

Stabilizing bone of the forearm

Medial and longer of the two forearm bones

Radius

Lateral and shorter of the two forearm bones

Annular ligament

Holds the proximal radius and ulna together

Ulnar collateral ligament

Connects the ulna to the humerus on the medial side of the elbow

Radial collateral ligament

Connects the radius to the humerus on the lateral side of the elbow

Movements of elbow and forearm

Flexion

Extension

Pronation

Supination

Flexor carpi ulnaris:

Origin, insertion, action

Flexor

Medial epicondyle of humerus

Pisiform bone, hamate and base of metacarpal 5

Flexes and adducts the wrist joint

Palmaris longus:

Origin, insertion, action

Flexor

Medial epicondyle of humerus

Palmar aponeurosis of hand

Flexes wrist joint

Flexor Carpi Radialis

Origin, insertion, action

Flexor

Medial epicondyle of humerus

Metacarpals 2 and 3

Flexes and abducts the wrist joint

Pronator Teres

Origin, insertion, action

Flexor

Medial epicondyle of humerus and coronoid process of ulna

Midshaft of radius

Pronation

Flexor digitorum superficialis

Origin, insertion, action

Flexor

Medial epicondyle of humerus, coronoid process of ulna and radius

Middle phalangers of medial four fingers

Flexes metacarpophalangeal joints and proximal interphalangeal joints of the middle four fingers

Flexes the wrist joint

Flexor digitorum profundus

Origin, insertion, action

Flexor

Ulna and interosseous membrane

Distal phalanges of medial four fingers

Flexes metacarpophalangeal joints and proximal and distal interphalangeal joints of the medial four fingers

Flexes the wrist joint

Flexor pollicis longus

Origin, insertion, action

Flexor

Radius and interosseous membrane

Distal phalanx of thumb

Flexes metacarpophalangeal and interphalangeal joint of the thumb

Pronator quadratus

Origin, insertion, action

Flexor

Distal anterior surface of ulna

Distal anterior surface of radius

Pronation

Brachioradialis

Origin, insertion, action

Extensor

Lateral supraepicondilar ridge of humerus

Distal end of radius

Flexor of elbow joint when forearm is mid-pronated

Extensor carpi radialis longus

Origin, insertion, action

Extensor

Lateral supraepicondilar ridge of humerus

Metacarpal 2

Extends and abducts the wrist

Extensor carpi radialis brevis

Origin, insertion, action

Extensor

Lateral epicondyle of humerus

Metacarpals 2 and 3

Extends and abducts the wrist

Extensor digitorum

Origin, insertion, action

Extensor

Lateral epicondyle of humerus

Middle and distal phalanges of medial four fingers via extensor

hoods

Extends medial four fingers -

Extends the wrist joint

Extensor digitiminimi

Origin, insertion, action

Extensor

Lateral epicondyle of humerus

Extensor hood of the little finger

Extends little finger

Extensor carpi ulnaris

Origin, insertion, action

Extensor

Lateral epicondyle of the humerus ulna

Metacarpal 5

Extends and adducts the wrist joint

Anconeus

Origin, insertion, action

Extensor

Lateral epicondyle of humerus

Olecranon of the ulna

Abduction of the ulna in pronation

Supinator

Origin, insertion, action

Extensor

Lateral epicondyle of humerus and ulna

Lateral surface of the radius

Supination

Abductor pollicis longus

Origin, insertion, action

Extensor

Ulna, radius and intervening interosseus mebrane

Metacarpal 1

Abducts the carpometacarpal joint of the thumb

Extensor pollicis brevis

Origin, insertion, action

Extensor

Radius and interosseous membrane

Proximal phalanx of the thumb

Extends carpometacarpal and metacarpophalangeal joints of the thumb

Extensor pollicis longus

Origin, insertion, action

Extensor

Ulna and interosseous membrane

Distal phalanx of thumb

Extends carpometacarpal, metacarpophalangeal and interphalangeal joints of the thumb

Extensor indicis

Origin, insertion, action

Extensor

Ulna and interosseous membrane

Extensor hood of index finger

Extends index finger