Damage to the radial nerve in the spinal groove spares the (DNB June 2009)
|A||Lateral head of triceps|
|B||Long head of triceps|
|C||Medial head of triceps|
Long head of triceps
Radial nerve - arise from posterior cord of the brachial plexus.
The nerve winds around the back of the arm, first between the long and medial heads of the triceps, then in the spiral groove on the back of the humerus, between the lateral and medial heads of the triceps.
a. It pierces the lateral fascial septum above the elbow and continues downward into the cubital fossa, between the brachialis and the brachioradialis muscles
b. In the spiral groove the nerve is accompanied by the profunda vessels and it lies directly in contact with the shaft of the humerus
a. Branches in the axilla - given to long and medial heads of triceps and posterior cutaneous nerve of the arm
b. Branches in the spiral groove - given to the lateral and medial heads of the triceps and to the an coneous
i. Lower lateral cutaneous nerve of the arm
ii. Posterior cutaneous nerve of the forearm
c. Branches in the anterior compartment of the arm- given branches to brachialis, brachioradialis and ECRL muscles
d. Articular branches to the elbow joint.