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Now still remains on group of the muscles of the back of the forearm. And this is the
group of muscles which has nothing to do with either the wrist or the fingers. One of them
is this muscle which can be considered as the direct continuation of the triceps. This muscle comes from the
back of the lateral epicondyle of the humerus and is inserted into the lateral surface of
the olecranon process. It helps the triceps in extending the elbow, this is the anconeus
muscle
and it's supplied by the radial nerve directly like the triceps. The second short muscle
is a deep muscle laying on
the upper third of the radius this muscle is the supinator muscle which is pierced by the posterior interosseous
nerve which is a branch of the radial nerve. Now, the third muscle
comes from the upper part of the supracondylar redge of the humerus and inserted into the
radius so it can be considered as the continuation
of the brachialis. So extending from the upper part of the supracondylar redge and inserted
into the lower end of the radius at the base of the styloid process, there is the brachioradialis
muscle which can be considered as a continuation
of the brachialis. Between the brachialis and the brachioradialis there is the radial
nerve which supplied both of them. The brachioradialis is also a flexor of the elbow like the brachialis.
So the brachioradialis flexes the elbow but when the forearm in a midprone position. That's
why we call it the muscle that initiate pronation and supination and when the forearm is put
in the midprone position. This finishes all what about the muscles of the back of the
forearm. Thank you very much