Surgical Anatomy: First Extensor Compartment

- Discussion:
- anatomic variations: of tendons in 1st extensor compartment;
- APL & EPB tendons may occupy separate canals, or lie together in one osseofibrous canal;
   - commonly there is one EPB and multiple APL;
   - there is separation of first extensor compartment more often in pts w/ DeQuervain's tenosynovitis than in those w/o condition;
- Anatomic Snuff Box:
   - lies just dorsal and distal to the radial stylid process;
   - radial border of snuff box is composed of APL & EPB which pass over the radial styloid process and etch a small groove on its lateral aspect; both travel through Tunnel I;
   - ulnar border of snuff box is EPL tendon and floor of scaphoid bone;
   - occasionally deep branch of radial artery is palpable where it crosses the scaphoid bone;
   - termainal branches of the superficial radial nerve are also palpable where they cross the EPL tendon

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, October 4, 2012 1:03 pm