Extensor Retinaculum

A tendon-like structure that crosses the carpals on the posterior side

Extensor Digitorum - Origin

Lateral epicondyle

Extensor Digitorum - Insertion

Phalanges of fingers 2-5

Extensor Digitorum - Action

Extension of fingers & wrist

Extensor Digitorum - Innervation

Radial nerve

Extensor Digiti Minimi - Origin

Lateral epicondyle

Extensor Digiti Minimi - Insertion

Phalanges of the 5th finger

Extensor Digiti Minimi - Action

Extension of 5th finger & wrist

Extensor Digiti Minimi - Innervation

Radial nerve

Extensor Carpi Ulnaris - Origin

Lateral epicondyle

Extensor Carpi Ulnaris - Insertion

Metacarpal V

Extensor Carpi Ulnaris - Action

Extension & adduction of the wrist

Extensor Carpi Ulnaris - Innervation

Radial nerve

Anconeus - Origin

Lateral epicondyle

Anconeus - Insertion

Olecranon process

Anconeus - Action

Extension of the elbow

Anconeus - Innervation

Radial nerve

Extensor Carpi Radialis Brevis - Origin

Lateral epicondyle

Extensor Carpi Radialis Brevis - Insertion

Metacarpal III

Extensor Carpi Radialis Brevis - Action

Extension of the wrist

Extensor Carpi Radialis Brevis - Innervation

Radial nerve

Extensor Carpi Radialis Longus - Origin

Lateral epicondyle & shaft of humerus

Extensor Carpi Radialis Longus - Insertion

Metacarpal II

Extensor Carpi Radialis Longus - Action

Extension & abduction of the wrist

Extensor Carpi Radialis Longus - Innervation

Radial nerve

Brachioradialis - Origin

Shaft of humerus

Brachioradialis - Insertion

Styloid process of radius

Brachioradialis - Action

Flexion of elbow

Brachioradialis - Innervation

Radial nerve

Supinator - Origin

Lateral epicondyle & elbow ligaments

Supinator - Insertion

Anterior radial shaft

Supinator - Action

Supination of the forearm

Supinator - Innervation

Radial nerve

Abductor Pollicis Longus - Origin

Posterior radial & ulnar shafts

Abductor Pollicis Longus - Insertion

Metacarpal I

Abductor Pollicis Longus - Action

Abduction of the thumb

Abductor Pollicis Longus - Innervation

Radial nerve

Extensor Pollicis Brevis - Origin

Posterior radial shaft

Extensor Pollicis Brevis - Insertion

Proximal phalanx of the thumb

Extensor Pollicis Brevis - Action

Extension of the thumb

Extensor Pollicis Brevis - Innervation

Radial nerve

Extensor Pollicis Longus - Origin

Posterior ulnar shaft

Extensor Pollicis Longus - Insertion

Distal phalanx of the thumb

Extensor Pollicis Longus - Action

Extension of the thumb

Extensor Pollicis Longus - Innervation

Radial nerve

Extensor Indicis - Origin

Posterior ulnar shaft

Extensor Indicis - Insertion

Posterior 2nd finger

Extensor Indicis - Action

Extension of the 2nd finger

Extensor Indicis - Innervation

Radial nerve