Coracobrachialis a muscle of flexor compartment of the arm is usually attached proximally to the tip of the coracoid process of scapula along with short head of biceps brachii and distally attached to the medial border of middle of shaft of humerus. During routine dissection of the upper limb, an anomalous coracobrachialis muscle was found on the left arm of a male cadaver. Its proximal attachment was from the fibrous band of medial intermuscular septum of arm. Its distal attachment was to the medial epicondyle of humerus and to the antebrachial fascia. Median nerve and brachial artery were seen passing deep to this muscle. This variation is important for clinicians and radiologists.