It is very common to see variations in the course of nerves and muscles of the arm. We observed one bilateral concurrent variation in the course of musculocutaneous nerve and origin of biceps brachii muscle. Musculocutaneous nerve, after piercing the coracobrachialis muscle gives one communicating branch to the median nerve and then supply the third head of biceps brachii and brachialis muscle in the right upper limb. After that it continues as the lateral cutaneous nerve of forearm.In the left upper limb musculocutaneous nerve is not piercing the coracobrachialis muscle but otherwise following the normal course.