Forearm Attachments

Pronator Teres

Proximal attachment:

• Ulnar head: coronoid process of the ulna

• Humeral head: medial epicondyle of humerus

Distal attachment: lateral surface of the middle radius

Flexor Carpi Radialis

Proximal attachment: medial epicondyle of the humerus

Distal attachment: base of the 2nd metacarpal

Palmaris Longus

Proximal attachment: medial epicondyle of the humerus

Distal attachment: flexor retinaculum, palmar aponeurosis

Flexor Carpi Ulnaris

Proximal attachment:

• Humeral head: medial epicondyle of humerus

• Ulnar head: posterior border of proximal olecranon of ulna

Distal attachment: pisiform, hook of hamate, 5th metacarpal

Flexor Digitorum Superficialis

Proximal attachment:

• Humeroulnar head: medial epicondyle of humerus, coronoid process of ulna

• Radial head: anterior border of proximal radius

Distal attachment: bodies of middle phalanges of medial 4 digits

Flexor Digitorum Profundus

Proximal attachment: medial and anterior surfaces of ulna, interosseous membrane

Distal attachment: bases of distal phalanges of medial 4 digits

Flexor Pollicis Longus

Proximal attachment: anterior surface of radius, interosseous membrane

Distal attachment: base of distal phalanx of the thumb

Pronator Quadratus

Proximal attachment: anterior surface of distal ulna

Distal attachment: anterior surface of distal radius

Brachioradialis

Proximal attachment: lateral supra-epicondylar ridge of humerus

Distal attachment: lateral surface of distal radius

Extensor Carpi Radialis Longus

Proximal attachment: lateral supra-epicondylar ridge of humerus

Distal attachment: base of 2nd metacarpal

Extensor Carpi Radialis Brevis

Proximal attachment: lateral epicondyle of humerus

Distal attachment: base of 3rd metacarpal

Extensor Digitorum

Proximal attachment: lateral epicondyle of humerus

Distal attachment: extensor expansions of medial 4 digits

Extensor Digiti Minimi

Proximal attachment: lateral epicondyle of humerus

Distal attachment: extensor expansions of 5th digit

Extensor Carpi Ulnaris

Proximal attachment: lateral epicondyle of humerus, posterior border of ulna

Distal attachment: base of 5th metacarpal

Supinator

Proximal attachment: lateral epicondyle of humerus, radial collateral ligament, annular ligament, supinator fossa/crest of ulna

Distal attachment: lateral, posterior, and anterior surfaces of proximal radius

Abductor Pollicis Longus

Proximal attachment: posterior surface of proximal/middle radius and ulna, interosseous membrane

Distal attachment: base of 1st metacarpal

Extensor Pollicis Brevis

Proximal attachment: posterior surface of distal radius, interosseous membrane

Distal attachment: base of proximal phalanx of thumb

Extensor Pollicis Longus

Proximal attachment: posterior surface of middle ulna, interosseous membrane

Distal attachment: base of distal phalanx of thumb

Extensor Indicis

Proximal attachment: posterior surface of distal ulna, interosseous membrane

Distal attachment: extensor expansion of 2nd digit