General / Anatomy

Question 1

What are the flexor zones of injury of the FINGERS?

Answer 1

Zone 1: to mid middle phalanx (A5, C3, FDP)

Zone 2: to MC neck (all other pulleys, bifurcation of FDS+FDP, TRL volar plates, ORL origin)

Zone 3: to base of MC (lumbricals)

Zone 4: to distal wrist crease (flexor retinaculum, FCR + FCU insertion, FDS, FDP, median nerve

Zone 5: below distal wrist crease (

Question 2

What are the flexor zones of injury of the THUMB?

Answer 2

T Zone 1: to mid proximal phalanx (FPL insertion)

T Zone 2: over prox phlanax to MC neck

T Zone 3: over MC

T Zone 4: (thenar group)

Question 3

What are the attachments of the pulleys?

Answer 3

A2 & A4: osseous bony attachment
(shorten 25% with flexion)

A1, A3, A5: insert into the volar plate they arise
(shorten 50% with flexion)