a tendon
The piriformis originates at the anterior sacrum and inserts at the greater trochanter of the femur.
Piriformis-- A muscle in the pelvic girdle that is closely associated with the sciatic nerve.
Piriformis syndrome is caused by the piriformis muscle compressing the sciatic nerve, leading to pain and discomfort in the buttocks and down one leg. This compression can be a result of muscle tightness, injury, overuse, or anatomical variations in the piriformis muscle. Physical activities that involve repetitive movements or sitting for prolonged periods can also contribute to the development of piriformis syndrome.
One effective joint action for the piriformis muscle is external rotation of the hip joint. This means that when the piriformis contracts, it helps in rotating the thigh bone outward at the hip joint.
The heart.
Piriformis
Piriformis
Glute medius
M. Piriformis
orthopedic surgeon
The piriformis muscle crosses the sciatic nerve in the buttock region. Compression or irritation of the sciatic nerve by the piriformis muscle can lead to sciatica symptoms like pain, tingling, or numbness in the buttock and down the leg.