The anconeus muscle (or anconaus/anconæus) is a small muscle on the posterior aspect of the elbow joint.
Some consider anconeus to be a continuation of the triceps brachii muscle. Some sources consider it to be part of the posterior compartment of the arm, while others consider it part of the posterior compartment of the forearm.
The Anconeus muscle can easily be palpated just lateral to the olecranon process of the ulna.
Read more about Anconeus Muscle: Origin and Insertion, Function, Innervation, Blood Supply, Additional Images