Arkansas Esthetician Practice Exam

The muscle that extends the length of the upper arm posteriorly and controls forward movement of the arm is the tricep. This muscle is located on the back of the upper arm and is responsible for elbow extension. The deltoid muscle, located on the shoulder, primarily helps to raise the arm to the side. The bicep muscle, located on the front of the upper arm, primarily helps to bend the elbow. The mandibular branch is not a muscle and is not located in the upper arm, making it an incorrect option.