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Laboratory 9. Extensor Region of Forearm and Dorsum of Hand
Step 6. Osteofibrous Compartments in Extensor Region

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Return to the extensor retinaculum and identify the individual tendons which pass through the six osteofibrous compartments:
  • first compartment - tendons of the abductor pollicis longus muscle and the extensor pollicis brevis muscle,
  • second compartment - tendons of the extensor carpi radialis longus muscle and the extensor carpi radialis brevis muscle,
  • third compartment - tendon of the extensor pollicis longus muscle,
  • fourth compartment - tendons of the extensor digitorum communis muscle and extensor indicis muscle [the extensor retinaculum in this region has been cut],
  • fifth compartment - tendons of the extensor digiti minimi muscle, and
  • sixth compartment - tendon of the extensor carpi ulnaris muscle.

Links and References:
Grant's: 6.104-6.106
Netter (1ed.): 418, 419, 443 (2ed.): 414, 415, 439
Rohen/Yokochi: 372 and 392