The biggest and most visable is Pectoralis major; that is the "pecks" in slang terms.
The muscle that flexes and adducts the arm at the shoulder, working alongside the pectoralis major, is the latissimus dorsi.
A tetanus shot is typically administered in the upper arm muscle, also known as the deltoid muscle.
The extension of the lower arm is a result of the contraction of the triceps muscle, which is located on the back of the upper arm. When the triceps contracts, it straightens the arm by extending the elbow joint.
The triceps brachii muscle is responsible for extending the forearm and allowing you to push objects away from your body. It is located on the back of the upper arm and is activated when straightening the arm.
Tricep: It is a muscle located at the back of the upper arm.
The pectorals major
which shoulder muscle allows you to adduct your arm
The muscle that flexes and adducts the arm at the shoulder, working alongside the pectoralis major, is the latissimus dorsi.
Pectoralis major
upper arm chest stomach calf butt
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 posterior deltoid is one extensor of the upper arm.
The primary muscle groups targeted during a chest press exercise are the pectoral muscles (chest muscles), the deltoids (shoulder muscles), and the triceps (back of the upper arm muscles).
Adducts and rotates the arm.
The brachialis is a muscle in the upper arm that flexes the elbow joint.
The upper arm is primarily composed of skeletal muscle. Specifically, muscles such as the biceps brachii and triceps brachii are responsible for movement and stability in the upper arm. These muscles are attached to the bones by tendons and are under voluntary control.
The tricep is the muscle on the underside of the upper arm. The muscle on the upper side is the bicep.