Which of the following muscles is located above the waist?

The deltoid muscle is located above the waist, specifically on the shoulder. Its primary function is to facilitate arm movements, such as abduction, flexion, and extension. The muscle is triangular in shape and covers the shoulder joint, playing a crucial role in lifting the arm and providing stability to the shoulder.

In contrast, the tibialis anterior is situated in the lower leg and is responsible for dorsiflexing and inverting the foot. The gastrocnemius, also in the lower leg, acts as a major calf muscle used in movements such as walking and running. The gluteus maximus is located in the hip area, but it is primarily involved with movements of the hip and thigh rather than being classified as part of the upper body. Since the deltoid is the only muscle listed that is positioned on the upper torso, it is correctly identified as the muscle located above the waist.