Coxa refers to the upper part of the thigh bone, known as the femur, which connects to the hip joint. It plays a crucial role in supporting the body's weight and facilitating movement, such as walking and running. The coxa is also involved in various activities that require leg mobility and stability. In anatomy, the term "coxa" can also refer to the hip region itself, which includes the acetabulum and surrounding structures. This area is essential for maintaining balance and posture, as well as enabling a wide range of motions in the lower body.