The piriformis is the name of a muscle that extends between the sacrum and the femoral head, the greater trochanter. It is a small muscle that sits deep under the large gluteal muscles and is involved in external rotation, extension and stretching of the hip joint.
The ear can be divided into three parts, the outer, middle and inner ear. The outer ear comprises the visible auricle and the ear canal, up to the eardrum. The middle ear is a cavity inside the eardrum and contains the three ossicles, the hammer, the anvil and the stirrup. Sound waves cause the eardrum to move and this movement is transmitted to the ossicles.
In the area around the buttock and hip there are many muscles and ligaments, to stabilize the pelvis and hip joint and create power and thrust forward. The gluteal muscles consist of several large muscles.
The heel has the function of a shock-absorbing cushion. The heel bone is the largest bone in the foot. Under the calcaneus bone is shock-absorbing fascia that acts as a resilient cushion. When you walk or run, you land on the heel, which then distributes the pressure to reduce the load on the joints upwards, in the ankle, knee, hip and back.
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