The fascial compartments of arm are the sectional divisions of the segments of the upper limb of the body. The segments of the upper limb are the arm and the forearm. Likewise, the lower limb can be divided into segments – the thigh, and the lower leg. The fascial compartments are formed by deep fasciae – tough connective tissue septa (walls), which divide and separate each segment. Each compartment encloses specific muscles and nerves.