- Anatomy:
- three posterior divsions of brachial plexus form
posterior cord: (
C5 ,
C6 ,
C7,
C8,
T1)
- upper
subscapular nerve to
subscapularis
- thoracodorsal to
latissimus dorsi
- lower
subscapular nerve to
subscapularis
and
teres major
-
axillary nerve
- radial nerve (
C5,
C6,
C7 ,
C8 , and
T1 ) is largest & most frequently injured branch of
brachial plexus.
- Injury:
- injury to the brachial plexus below the clavicle usually involves cords cords or peripheral nerves;
- damage to the posterior cord weakens elbow, wrist, and MP joint extension
(
radial nerve), and shoulder abduction (from
axillary nerve);
