However, Keener et al. (2010) reported that the lateral triceps tendon actually continues further to the level of the lateral aspect of the proximal ulna and in fact blends with the the superior anconeus fascia and antebrachial fascia. (strengthandconditioningresearch.com)
Muscles producing movements at the elbow and forearm are the triceps brachii, brachioradialis, brachialis, biceps brachii and the anconeus. (sportsinjuryclinic.net)
It's located on back of the back of the upper arm, situated inferior to the posterior deltoid and superior to anconeus. (kingofthegym.com)