Extensor Tendon Compartments
(Redirected from Third Dorsal Compartment)
Description
Other Names
- Extensor Tendon Compartments of the Wrist
- Dorsal Extensor Compartments of the Wrist
General Description
- 6 Tunnels which transmit the extensor tendons of the forearm into the hand
- Located on the dorsal wrist
- Each tunnel is lined internally by a synovial sheath
- The tunnels are separated from each other by a fibrous sheath
Compartment 1
- Located on the lateral or radial aspect of the wrist
- Tendons contained
- Associated Pathology
- Note: In about 1/3 of patients, the EPB tendon is compartmentalized off from the APL tendon[6]
Compartment 2
- Tendons contained
- Separated from compartment 3 by Listers Tubercle
- Bony prominence on the distal radius
Compartment 3
- Tendons contained
Compartment 4
- Tendons contained
Compartment 5
- Tendons contained
Compartment 6
- Tendons contained
Anatomic Landmarks
1st and 2nd Dorsal Compartment Intersection
- Compartment 1 crosses obliquely and superficially over compartment 2
- Angle is approximately 60 in the distal forearm
- Approximately 4-6 cm proximal to Lister's tubercle
2nd and 3rd Dorsal Compartment Intersection
- The 3rd dorsal compartment crosses superficially to the 2nd dorsal compartment
- This happens at approximately Lister's tubercle
Extensor Retinaculum
Terms
- Extensor retinaculum
- Dorsal carpal ligament
- Posterior annular ligament
Description
- Strong, fibrous band, extending obliquely downward and medially across the back of the wrist
- Thick portion of the antebrachial/forearm fascia
- Responsible for holding extensor tendons in place
- There are six separate synovial sheaths (described above)
Histology
- Deepest layer: gliding layer composed of hyaluronic acid secreting cells
- Middle layer: thick, consists of elastin, collage and fibroblasts
- Superficial layer: loose connective tissue, vascular channels
Clinical Significance
See Also
References
- ↑ Image courtesy of teachmeanatomy.info, "The Extensor Tendon Compartments of the Wrist"
- ↑ Image courtey of orthobullets.com, "Extensor Tendon Compartments"
- ↑ Kushal, R., et al. "MEng/De Quervain's disease." Eplasty 13 (2013): 52.
- ↑ Image courtesy of Malanga, Gerard A., and Kenneth R. Mautner. "Atlas of ultrasound-guided musculoskeletal injections." (No Title) (2014).
- ↑ Li, Tony Y. "Unique sonographic presentation of distal intersection syndrome." Journal of Diagnostic Medical Sonography 33.5 (2017): 428-432.
- ↑ Motoura H, Shiozaki K, Kawasaki K. Anatomical variations in the tendon sheath of the first compartment. Anat Sci Int. 2010 Sep;85(3):145–151. Epub December 29, 2009.