This structure of the extensor mechanism lies volar to the axis of the proximal interphalangeal (PIP) and dorsal to the axis of the PIP
a. Flexor digitorum profundus (FDP)
b. Lumbricles
c. Oblique retinacular ligament (ORL)
d. Transverse retinacular ligament
ANS: C
The FDP stays volar to both joints while the lumbricles traverse to the dorsal surface at the MP joint. The ORLs begin volar and just before the distal interphalangeal (DIP) move dorsally to blend with the extensor hood.
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