Aim to study the variation in the branches of medial cord of brachial plexus. 100 upper limbs of 50 donated embalmed cadavers (45 males & 5 females) of age group ranging from 70 to 80 years were dissected in the department of Anatomy at K. J. Somaiya Medical College, Sion, Mumbai, India. The variations in the branches of medial cord of brachial plexus were observed in 2 specimens. The musculo - vascular pattern in the arm was also observed. The photographs of the variation of the formation of median nerve were taken for proper documentation. Variations in the formation of brachial plexus are common and have been reported by several investigators in relation to origin of roots, trunks, cords, divisions and branches. The nerves of the extremities are especially vulnerable to injury because of their long course and superficial distribution. The basic anatomy of median and ulnar nerves in the upper limb is well described in the textbooks. Previously, an ample amount of work has been done upon the communications between the median and ulnar nerves in the forearm and hand. In the present study, an unreported pattern was seen where whole of the ulnar nerve was arising from the median nerve in the arm. Its phylogeny and clinical implications are discussed in detail. A lack of awareness of variations might complicate surgical repair and may cause ineffective nerve blockade.