* Arises from the posterior cord. It is the largest branch of the brachial plexus.
* Descends posteriorly between the long and medial heads of the triceps, passes in the spiral groove on the back of the humerus.
* Pierces the lateral intermuscular septum to enter the anterior compartment and descends anterior to the lateral epicondyle to enter the cubital fossa, where it divides into superficial and deep branches.
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* Arises from the posterior cord. It is the largest branch of the brachial plexus.
* Descends posteriorly between the long and medial heads of the triceps, passes in the spiral groove on the back of the humerus.
* Pierces the lateral intermuscular septum to enter the anterior compartment and descends anterior to the lateral epicondyle to enter the cubital fossa, where it divides into superficial and deep branches.
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