Aim to study the variant distal attachment of brachialis muscle. 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 variant distal attachment of brachialis muscle was observed in 2 specimens. The neurovascular pattern was also observed. The photographs of the variation of the variant distal attachment of brachialis muscle were taken for proper documentation. The variant distal attachments of brachialis muscle were observed in 2 specimens. An additional insertion of brachialis muscle was observed. The origin of the accessory muscle belly was from the anteromedial surface of the shaft and the medial supracondylar ridge of the lower end of the humerus. The accessory muscle slip merged with the tendon of pronator teres and got inserted on to the upper one third of the lateral surface of the shaft of the radius. The accessory muscle belly of the brachialis muscle was innervated by musculocutaneous nerve. The median nerve and the brachial artery travelled deep to the accessory muscle belly of the brachialis muscle. The role of additional muscles in compression syndrome is a well-known phenomenon. Similar to the biceps brachii muscle, the brachialis got inserted on the radius bone, and therefore can participate in pronation and supination of the forearm. There were no associated altered anatomy of the blood vessels observed in the specimen. The knowledge of such type of variation is clinically important for Anatomists, Neurologists, Radiologists, Surgeons Plastic surgeons and Orthopedicians.