Piriformis (of the Deep Lateral Rotator Group) – myofascial trigger points and their referral zones.
Deep lateral rotator group:
- piriformis
- superior gemellus
- obturator internus
- inferior gemellus
- obturator externus
- quadratus femoris

Posterior view of myofascial trigger points in the right-side piriformis and their corresponding referral zones.