The inner part of your arm is commonly referred to as the inner arm or medial arm. This area includes the inner side of the upper arm (between the shoulder and elbow) and the inner side of the forearm (between the elbow and wrist).
In anatomical terms, the inner part of the upper arm is known as the medial brachium, while the inner part of the forearm is called the medial antebrachium. These terms are used to describe the specific regions of the arm in a more precise manner.
The inner arm contains important structures such as muscles, blood vessels, and nerves. For example, the biceps brachii muscle, which is responsible for flexing the elbow, is located in the upper arm. The brachial artery and median nerve also run through this area, supplying blood and nerve signals to the arm and hand.
Understanding the anatomy of the inner arm can be useful for various reasons, such as identifying the location of pain or discomfort, performing medical procedures, or simply gaining a better knowledge of how your body works.