The piriformis muscle originates at the internal surface of the sacrum and inserts at the superior border of the trochanter of the femur. It functions in helping lateral rotation of the hip joint, abducting the thigh when the hip is flexed, and assisting stability of the head of the femur in the acetabulum.

What bone does the piriformis connect to?

The piriformis muscle is a small but mighty muscle located deep in the buttock. It starts at the lower spine and connects to the upper surface of each femur or thighbone.

What muscles are connected to the piriformis?

The piriformis muscle is intimately associated with gluteus medius, gluteus maximus, obturator internus, and the gemelli muscles.