There are so many bones that you need more than one muscle to take care of them
It isn't. The triceps brachii muscle (which is actually a group of three muscles) is the strongest set of muscles in the arm and accounts for nearly 60% of the upper arm's muscle mass. The triceps are primarily responsible for the extension of the elbow joint (straitening of the arm).
Your triceps and your biceps. These muscles are part of the skeletal muscle group they move by contracting and relaxing.
Petorial muscles
The two major muscles of the upper arm are the biceps on the front and the triceps on the back.
Triceps
triceps
biceps and triceps
deltroid
Triceps Surae
Muscle of the hand.
The triceps are the largest muscle group in the arm. So, if you want big upper arms, concentrate on working your triceps rather than working your biceps. .
Any muscle group in the legs or abdominal areas. Also it wouldn't hurt to strengthen your arms.