Editing Upper limb (section)

====Forearm====
[[File:Gray414.png|thumb|90px|Ventral superficial muscles of the forearm]]
{{Main|Forearm}}
The forearm ({{langx|la|antebrachium}}),<ref name="Thieme-Atlas-208" /> composed of the [[Radius (bone)|radius]] and [[ulna]]; the latter is the main distal part of the elbow joint, while the former composes the main proximal part of the wrist joint.

Most of the large number of muscles in the forearm are divided into the wrist, hand, and finger extensors on the dorsal side (back of hand) and the ditto flexors in the superficial layers on the ventral side (side of palm).  These muscles are attached to either the [[Lateral epicondyle of the humerus|lateral]] or [[Medial epicondyle of the humerus|medial epicondyle]] of the humerus.  They thus act on the elbow, but, because their origins are located close to the centre of rotation of the elbow, they mainly act distally at the wrist and hand.  Exceptions to this simple division are [[brachioradialis]]&nbsp;— a strong elbow flexor&nbsp;— and [[palmaris longus]]&nbsp;— a weak wrist flexor which mainly acts to tense the [[palmar aponeurosis]].  The deeper flexor muscles are extrinsic hand muscles; strong flexors at the finger joints used to produce the important power grip of the hand, whilst forced extension is less useful and the corresponding extensor thus are much weaker.
<ref name="Sellers-6">{{harvnb|Sellers|2002| pp=6–7}}</ref>

Biceps is the major supinator (drive a screw in with the right arm) and [[pronator teres]] and [[pronator quadratus]] the major pronators (unscrewing)&nbsp;— the latter two role the radius around the ulna (hence the name of the first bone) and the former reverses this action assisted by [[supinator]].  Because biceps is much stronger than its opponents, supination is a stronger action than pronation (hence the direction of screws).
<ref name="Sellers-6" />

; Muscles: of the forearm<ref name="Thieme-Atlas-256" />
:; Posterior: (Superficial) [[extensor digitorum]], [[extensor digiti minimi]], [[extensor carpi ulnaris]], (deep) [[supinator]], [[abductor pollicis longus]], [[extensor pollicis brevis]], [[extensor pollicis longus]], [[extensor indicis]]
:; Anterior: (Superficial) [[pronator teres]], [[flexor digitorum superficialis]], [[flexor carpi radialis]], [[flexor carpi ulnaris]], [[palmaris longus]], (deep) [[flexor digitorum profundus]], [[flexor pollicis longus]], [[pronator quadratus]]
:; Radial: [[Brachioradialis]], [[extensor carpi radialis longus]], [[extensor carpi radialis brevis]]