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https://upload.orthobullets.com/topic/10104/images/pincoarse1500.jpg
https://upload.orthobullets.com/topic/10104/images/pin.jpg
https://upload.orthobullets.com/topic/10104/images/newpinsensory1500.jpg
https://upload.orthobullets.com/topic/10104/images/pincth.jpg
https://upload.orthobullets.com/topic/10104/images/pinsensory700.jpg
https://upload.orthobullets.com/topic/10104/images/ughsensory700.jpg
 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 Frohse (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) 
 

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