Variant nerves in the infraclavicular part of brachial plexus
Ulnar nerve usually is a branch of the medial cord of brachial plexus. In a study conducted on 20 upper limbs, variation in its origin was observed in one right upper limb. Ulnar nerve had two roots of origin, one arising from the medial cord and another from the lateral cord. The rest of the course of the ulnar nerve was as usual. In another left upper limb a communicating branch was observed between the musculocutaneous nerve and median nerve.