A rare conglomeration of neurovascular variations in the brachium-antebrachium: clinico-embryological elucidation.

: During routine dissection in left upper limb in an elderly male cadaver, variations in the arterial and neural pattern were noticed. The undersized brachial artery divided terminally into radial and ulnar artery at a distance of 15.4 cm from the tip of coracoid process, proximal to its usual division in cubital fossa. Additionally, the superior and inferior ulnar collateral artery instead of arising from the brachial artery, emanated from ulnar artery. The course of the median nerve also deserves a brief mention as it crossed the brachial artery from medial to lateral side to position itself laterally in the midbrachium. Coursing further, it shifted from lateral to medial side over the ulnar artery in the distal third of arm, thus placing itself medial to ulnar artery in the cubital fossa. There was also a communication between a medial offshoot of the musculocutaneous nerve and the median nerve 3 cm from the bifurcation of the brachial artery. Although the variations in the origin, termination, course and branching pattern of upper limb vessels and nerves are well documented, but the multitude of disparity in morphology with confusing neurovascular assembly put together in the same limb denotes an outstanding case. An attempt has been made to correlate the present anatomical variations with embryological aspects. Moreover, the clinical inferences of such variations are discussed for planning, performing and analyzing invasive and noninvasive clinical procedures in this region.