Which of the following is NOT located on the anterior surface of the body?

The correct answer is that the Erector Spinae is not located on the anterior surface of the body. The Erector Spinae group is a set of muscles that runs along the spine, primarily responsible for extending and stabilizing the vertebral column. These muscles are positioned posteriorly, meaning they are situated on the back or dorsal side of the body.

In contrast, the Pectoralis major is a large muscle located in the chest area, primarily involved in movements of the shoulder joint. The Tibialis anterior is situated in the lower leg and is crucial for dorsiflexion of the foot. The Rectus Femoris is one of the quadriceps muscles found in the thigh and contributes to both hip flexion and knee extension. Each of these muscles plays a role in movements accessible from the anterior aspect of the body, which highlights the distinction between anterior and posterior muscle locations.