Piriformis
The Piriformis muscle is an important muscle. The sciatic nerve passes underneath this muscle on its route down to the posterior thigh. In some individuals the nerve can actually pass right through the muscle. This can lead to sciatica symptoms due to a condition known as piriformis syndrome
Origin
- Anterior surface of the lateral sacrum.
Insertion
- Greater trochanter of the femur.
Actions
- External rotation of the hip.
- Hip abduction.
Innervation
- Branch of the sacral plexus.
Daily uses
- Taking the first leg out of the car.
Example strengthening exercises
- Hip extension with external rotation.
Example stretches
- Piriformis stretch.
Related injuries
- Piriformis syndrome.
Related muscles
- Gluteus minimus.
- Gluteus medius.
- Gluteus maximus.
