Detailed summary of the muscles, blood supply & nerves of the forearm

FOREARM FLEXORS
ANTERIOR COMPARTMENT
 Known as "flexor compartment" of forearm
 Muscles arranged in two layers → superficial & deep
 Movement
o Flexion & deviation of wrist
o Flexion of fingers & thumb
o Pronation
 Innervation → All by median nerve
o Except flexor carpi ulnaris & medial half of flexor digitorum profundus
→ innervated by ulnar nerve




SUPERFICIAL LAYER
PRONATOR TERES
 Origin → medial epicondyle of humerus & coronoid process of ulna
 insertion → common tendon into lateral radius (midshaft)
 Innervation → median nerve

,  Action → pronates forearm & weak flexion




FLEXOR CARPI RADIALIS
 Origin → medial epicondyle of humerus
 Insertion → bases of 2nd and 3rd metacarpals
 Action → flexion & abduction of wrist (radial deviation)




PALMARIS LONGUS
 Origin → medial epicondyle of humerus
 Insertion → palmar aponeurosis
 Action → weak flexion of wrist, tenses skin of palm

, FLEXOR CARPI ULNARIS
 Origin → medial epicondyle of humerus, olecranon process & posterior ulna
 Insertion → pisiform, hamate & fifth metacarpal
 Action → flexes & adducts wrist




FLEXOR DIGITORUM SUPERFICIALIS
 Palmar
 Origin → medial condyle of humerus
o Ulnar head - medial coronoid area
o Radial head - radial tuberosity area
 Insertion → split tendons attach to the sides of the middle phalanx of the four fingers
(palmar surface)
 Action → flexion of elbow, wrist & fingers