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