Extensor hood: expansion is 10 to 12 mm long and arises from the deep surface of the tendon, crosses the capsule of the MP joint without blending ; dorsal tranverse carpal ligament: consists of compartments in which certain extensor tendons are contained. Six extensor compartments. Compartments are covered dorsally by the extensor retinaculum or dorsal annular ligaments.

The EDC is dorsal to the capsule, sends a deep expansion that inserts into the base of distal phalanx, it then divides into the medial slip and two lateral slips which receive insertion from the interossei, a deep tranverse ligament stabilizes the extensor tendon.


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Lorie Richards and Janice Loudon, University of Kansas Medical Center, School of Allied Health,
Occupational and Physical Therapy Education, October 1997