Superficial Extensors

• Extensors of the Wrist and Fingers - Superficial layer:

  • Extensor carpi radialis longus (ECRL)
  • Extensor carpi radialis brevis (ECRB)
  • Extensor digiti minimi (EDM)
  • Extensor carpi ulnaris (ECU)
  • Extensor digitorum (ED)

  
• when the word carpi is involved think:

  • insertion is on base of corresponding metacarpal
• • muscles that dont originate from CEO (ECRL) = NS is radial nerve
  • muscles that originate from CEO = NS is posterior interosseus branch of radial nerve
• • extensor carpi radialis longus = origin is lower 1/3 of lateral supracondylar ridge and adjacent intermuscular septum
  • other superficial extensor muscles = origin is common extensor origin (extensor carpi ulnaris also originates posterior border ulna)
• Extensor carpi muscles all action is:
• All Extensor carpi muscles action is:

  • wrist extension and deviation of corresponding bone