- 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 thru
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;
