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  Cervical C5, C6.

  
  
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  Posterior to the third part of axillary artery.

  
  
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  Run laterally to the surgical neck of the humerus.

  
  
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  Posterior branch gives off the upper lateral nerve of the arm.

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  Cutaneous innervation of the shoulder.

  
  
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  Deltoid.

  
  
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  Shoulder joint.

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  Contraction of the deltoid.

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  Cervical C5, C6.

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  Cutaneous innervation of the lateral part of the forearm.

  
  
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  Ventral musculature of the arm.

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  Flexion of the forearm by contraction of the biceps (long and short head).

  
  
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  Possible confusion with a radial stimulation. The contraction of the supinator and brachioradialis muscles innervated by the radial gives a flexion and supination of the forearm.

The contraction of the supinator and brachioradialis muscles innervated by the radial gives a flexion and supination of the forearm.

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  Cervical C6, C8.

  
  
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  Posterior to the axillary and brachial arteries.

  
  
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  Run with the profunda brachii artery between the long and medial heads of triceps.

  
  
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  Before leaving the axilla, the radial nerve gives the posterior cutaneous nerve of arm that innervates the posterior upper arm skin.

  
  
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  The posterior cutaneous nerve of forearm innerves the posterior forearm skin.

  
  
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  The deep radial branch innerves the forearm musculature and posterior part of carpal bones.

  
  
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  The superficial radial nerve passes over the tendons of the snuff box and terminates as cutaneous branches to the dorsum of the hand.

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  Cutaneous innervation of the posterior part of the arm, forearm, and posterolateral part of the hand.

  
  
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  Extensor muscles (dorsal musculature in the upper extremity below the shoulder).

  
  
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  Radioulnar joint and wrist joint.

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  Extension and supination of forearm.

  
  
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  Extension of the wrist and the fingers.

  
  
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  Abduction and extension of the thumb.

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  Cervical C6, thoracic T1.

  
  
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  The median nerve lies lateral to the axillary artery and then lateral to the brachial artery before crossing the artery at the level of the midhumerus.

  
  
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  Gives branch to elbow joint (superior portion of the radioulnar joint): capitulum of humerus, radial head, and epitrochlea of humerus.

  
  
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  Gives branch to pronator muscles at level of forearm (one of the terminal branches is the anterior interosseous n.).

  
  
  
  
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    Arises just below the two heads of pronator teres m.

    
    
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    Contraction of flexor digitorum superficialis = flexion of proximal interphalangeal (IP) joints and secondary metacarpophalangeal (MCP) joints and wrist.

    
    
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    Contraction of flexor digitorum profundus (60% to 70% median and 30% to 40% ulnar) = flexion of distal IP joints and secondary flexion of proximal IP and MCP joints and wrist.

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  Elbow joint (radioulnar joint).

  
  
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  Cutaneous innervation of the lateral palmar skin.

  
  
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  Ventral musculature of the forearm (flexor and pronator muscles).

  
  
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  Wrist and lower radioulnar joint (sensory supply to the anterior part of carpal bones).

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  Flexion of the fingers and wrist.

  
  
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  Pronation of the wrist.

  
  
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  Opposition of the thumb (adductor pollicis brevis and opponens pollicis).

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  Cervical C8, thoracic T1.

  
  
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  Medial to the axillary and brachial arteries.

  
  
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  Gives a branch to elbow joint: olecranon and medial epicondyle of humerus.

  
  
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  Divides into terminal branches at the pisiform bone.

  
  
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  Dorsal cutaneous branch arises 5 cm proximal to the wrist; passes deep to flexor carpi ulnaris.

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  Cutaneous innervation of the medial part of the hand.

  
  
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  Ventral musculature of the hand.

  
  
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  Deep terminal branch: wrist joint, interossei, lumbricals, adductor pollicis, flexor pollicis brevis.

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  Adduction of the thumb and little finger.

  
  
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  Prehension by the little finger and thumb.

  
  
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  Adduction and supination of the wrist.

  
  
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  Martin and Gruber anastomosis: see median.