Please confirm topic selection

Are you sure you want to trigger topic in your Anconeus AI algorithm?

Please confirm action

You are done for today with this topic.

Would you like to start learning session with this topic items scheduled for future?

Updated: Nov 7 2015

Posterior interosseous nerve

 Course
 
  • Origins
    • originates from the radial nerve at the radiohumeral joint line
  • Course
    • arcade of Frosche at radial head
      • dives under supinator at arcade of Frosche (thickened edge of between heads of supinator)
    • forearm posterior compartment
      • winds around radial neck within substance of muscle to posterior compartment of forearm
    • interosseous membrane
      • reaches interosseous membrane of forearm and ends as sensation to dorsal wrist capsule
    • dorsal wrist capsule
Motor Innervation

  • Motor
    • common extensors
      • ECRB (often from radial nerve proper, but can be from PIN) 
      • Extensor digitorum communis (EDC) 
      • Extensor digiti minimi (EDM) 
      • Extensor carpi ulnaris (ECU) 
    • deep extensors
      • Supinator 
      • Abductor pollicis longus (APL) 
      • Extensor pollicus brevis (EPB) 
      • Extensor pollicus longus (EPL) 
      • Extensor indicis proprius (EIP) 
 
 
 
Senory Innervation
 
 
  • Sensory
    • sensory fibers to dorsal wrist capusle
      • provided by terminal branch which is located on the floor of the 4th extensor compartment
    • no cutaneous innervation
 
Clinical
  • PIN compression Syndrome 
    • in PIN palsy,  the last muscle to recover is the extensor indicis proprius 
  • Dorsal Approach to Radius (Thompson) 
Private Note