Read on to learn more about the muscles in the arm, their functions, and conditions that can affect the arm muscles.

Forearm muscles anatomy There are two basic categories of forearm muscles: Intrinsic. These muscles move your forearm by turning the bones inward (toward your body) and outward (away from your body).

The deltoid is a muscle responsible for lifting the arm and helping the shoulder to move. Strains and injuries from overuse can lead to pain. In this article, learn about the types of deltoid ...