It's probably not correct, but I believe it's the palmaris longus muscle found in the distal end of the arm. It may have a function, but it's the most useless out of any muscle in the arm. It is proximal to the wrist. I have been looking for this question as well and this is the best I could come up with.
The children learn that Tom Robinson's left arm is useless to him, as it was caught in a cotton gin, and tore out all of the muscle in that arm.
There is not a single muscle that rotates the upper arm. The name of the muscle that contributes in rotation of the upper arm is deltoid muscle.
The Human Brain
The brachialis is a muscle in the upper arm that flexes the elbow joint.
What are the tendon in your arm?
no
where you bored when you posted this question or have you pop you muscle in you left arm
Deltoid
Biceps or triceps
which shoulder muscle allows you to adduct your arm
The posterior deltoid is one extensor of the upper arm.
It depends. But, the triceps are 2/3 of your upper arm.