Superficial radial nerve

From Ganfyd

Jump to: navigation, search

The superficial radial nerve is a terminal branch of the radial nerve.

Superficial radial nerve

System:
Function:
Origin: Radial nerve
Branches:
Insertion:
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation: Skin of the dorsum of the hand and the lateral three and a half digits
Vertebral levels:
Search for Superficial radial nerve in Gray's.


Contents

Anatomical Course

The nerve descends anterolaterally from the lateral epicondyle. It is lateral to the radial artery and posterior to brachioradialis through much of its course. It lies initially on supinator, then pronator teres, the radial head of flexor digitorum superficialis and most distally flexor pollicis longus. Three quarters of the way down the forearm it leaves the radial artery, passing deep to the brachioradialis tendon to curve around the lateral border of the radius. It pierces the deep fascia to divide into five dorsal digital nerves.

Sensory Supply

  • The first dorsal digital nerve supplies the skin of the lateral side of the thumb and thenar eminence up to the fingernail
  • The second dorsal digital nerve supplies the medial side of the thumb to the base of the fingernail
  • The third dorsal digital nerve supplies the lateral side of the index finger up to the middle of the middle phalanx
  • The fourth dorsal digital nerve supplies the medial side of the index finger to the middle of the middle phalanx and the lateral side of the middle finger to the proximal interphalangeal joint
  • The fifth dorsal digital nerve supplies the the medial side of the middle finger and the lateral side of the ring finger to their proximal interphalangeal joints

Communications

Variations

  • The fifth dorsal digital nerve may be absent, its territory instead supplied by a branch of the dorsal cutaneous branch of the ulnar nerve
  • The nerve may supply the entire dorsum of the hand