Painkillers, specifically narcotics, can cause constipation. A lot of receptors for the narcotic class of drugs are in the digestive tract, so it tends to bring everything to a halt, says Thomas Park, MD, a gastroenterologist with the University of Rochester Medical Center Park in New York.
Full Muscles of the Leg and Foot Description. [Continued from above] . . . The anterior muscles, such as the quadriceps femoris, iliopsoas, and sartorius, work as a group to flex the thigh at the hip and extend the leg at the knee.Posterior muscles, such as the hamstrings and gluteus maximus, produce the opposite motion â extension of the thigh at the hip and flexion of the leg at the knee.Continued from above] . . . The anterior muscles, such as the quadriceps femoris, iliopsoas, and sartorius, work as a group to flex the thigh at the hip and extend the leg at the knee.
Anatomy and supply. The quadriceps femoris muscle is a four-headed muscle of the thigh which almost completely covers the femur femoral nerve (L2-4). In detail the quadriceps consists of: 1  Rectus femoris muscle: has two origins at the anterior inferior iliac spine of the pelvis and the upper margin of the acetabulum. 2  Distally its fibers end in the common insertion tendon (quadriceps tendon).