Upper Limb Guide

Anterior compartment of the arm

• Biceps brachii m.

• Coracobrachialis m.

• Brachialis m. 

Posterior compartment of the arm

• Triceps brachii m.

• Anconeus (seen in posterior forearm)

Anterior compartment of the forearm

Superficial Layer

• Pronator teres

• Flexor carpi radialis m.

• Palmaris longus m.

• Flexor carpi ulnaris m.

Middle Layer

• Flexor digitorum superficialis m.

Deep Layer

• Flexor digitorum profundus m.

• Flexor pollicis longus m.

• Pronator quadratus m.

Posterior compartment of the forearm

Superficial Layer

• Brachioradialis m.

• Extensor carpi radialis longus m.

• Extensor carpi radialis brevis m.

• Extensor digitorum m.

• Extensor digiti minimi m.

• Extensor carpi ulnaris m.

Deep Layer

• Supinator m.

• Abductor pollicis longus m.

• Extensor pollicis longus m.

• Extensor pollicis brevis m.

Thenar compartment of the hand 

• Abductor pollicis brevis m.

• Flexor pollicis brevis m.

• Opponens pollicis m.

• The tendon from the flexor pollicis longus m. also resides in this compartment

Hypothenar compartment of the hand

• Abductor digiti minimi m.

• Flexor digiti minimi brevis m.

• Opponens digiti minimi m.

Deep compartment of the hand

• Adductor pollicis m. 

• Palmar interossei m.

• Dorsal interossei m.