Compartments 
Origin 
Insertion 
Innervation 
Thenar 
Abductor pollicis brevis 
Trapezium/scaphoid 
Radial base of thumb P1 
Median (recurrent motor branch) 
Flexor pollicis brevis 
Trapezium 
Base of thumb P1 
Median (recurrent motor branch) 
Opponens pollicis 
Trapezium 
Radial base of thumb P1 
Median (recurrent motor branch) 
Adductor 
Adductor pollicis 
Capitate/third metacarpal 
Ulnar base of thumb P1 
Ulnar 
Hypothenar 
Abductor digiti minimi 
Pisiform 
Ulnar base of small P1 
Ulnar 
Flexor digiti minimi brevis 
Hook of hamate 
Base of small P1 
Ulnar 
Opponens digiti minimi 
Hook of hamate 
Ulnar base of small P1 
Ulnar 
Interosseous 
Dorsal interossei (4) 
#2, 3, 4, 5 metacarpals 
Radial or ulnar base of P1 
Ulnar 
Volar interossei (3) 
#2, 4, 5 metacarpals 
Radial or ulnar base of P1 
Ulnar 
Carpal Tunnel 
Flexor digitorum profundus and superficialis tendons, lumbricals, flexor pollicus longus tendon, median nerve 
Hook of hamate 
Scaphoid tubercle 

Superficial Volar Forearm 
Pronator teres 
Medial epicondyle 
Midthird of radius 
Median 
Flexor carpi radialis 
Medial epicondyle 
Base of #2 MC 
Median 
Palmaris longus 
Medial epicondyle 
Palmar fascia of hand 
Median 
Flexor carpi ulnaris 
Medial epicondyle 
Pisiform/base of #5 MC 
Median 
Flexor digitorum superficialis 
Medial epicondyle 
Base of #2, 3, 4, 5 P2 
Median 
Deep Volar Forearm 
Flexor digitorum profundus 
Ulna/interosseous membrane 
Base of #2, 3, 4, 5 P3 
#2, 3 – Median (ant. interosseous branch)
#4, 5 – Ulnar nerve 
Flexor pollicis longus 
Distal third of radius 
Base of thumb P2 
Median (ant. interosseous branch) 
Pronator quadratus 
Distal third of ulna 
Distal third of radius 
Median (ant. interosseous branch) 
Dorsal Forearm 
Abductor pollicis longus 
Midthird dorsal radius 
Radial base of thumb MC 
Radial (post. interosseous branch) 
Extensor pollicis brevis 
Midthird dorsal radius 
Dorsal base of thumb P1 
Radial (post. interosseous branch) 
Extensor pollicis longus 
Dorsal ulna 
Dorsal base of thumb P2 
Radial (post. interosseous branch) 
Extensor digitorum communis 
Lateral epicondyle 
Dorsal base of #2, 3, 4, 5 P3 
Radial (post. interosseous branch) 
Extensor indicis proprius 
Dorsal ulna 
Dorsal base of #2 P3 
Radial (post. interosseous branch) 
Extensor digiti quinti 
Lateral epicondyle 
Dorsal base of #5 P3 
Radial (post. interosseous branch) 
Extensor carpi ulnaris 
Lateral epicondyle 
Dorsal base of #5 MC 
Radial (post. interosseous branch) 
Supinator 
Lateral epicondyle 
Proximal third of radius 
Radial (post. interosseous branch) 
Mobile Wad 
Brachioradialis 
Lat. condyle humerus 
Distal radius styloid 
Radial 
Extensor carpi radialis longus 
Lat. condyle humerus 
Dorsal base of #2 MC 
Radial 
Extensor carpi radialis brevis 
Lat. condyle humerus 
Dorsal base of #3 MC 
Radial (post. interosseous branch) 
P1, proximal phalanx; P2, middle phalanx; P3, distal phalanx; ant., anterior; MC, metacarpal; post., posterior; lat., lateral. 