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Piriformis
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| |
| Piriformis | |
|---|---|
| Muscle Type | |
| Origin | 2, 3, 4 costotransverse bars of anterior sacrum, few fibers from superior border of greater sciatic notch |
| Insertion | Anterior part of medial aspect of greater trochanter of femur |
| Action | Externally rotates and stabilises the hip |
| Synergists | The lateral hip rotators |
| Antagonists | |
| Spinal innervation | S1, S2 |
| Peripheral Innervation | Nerve to piriformis |
| Vasculature | Inferior gluteal, lateral sacral and superior gluteal artery. |
| Feature | Piriformis Syndrome |
Sacral Plexus Images
Sacral Plexus
Superior gluteal nerve
Inferior gluteal nerve
Nerve to piriformis
Sciatic nerve
Nerve to quadratus and inferior glemellus
Nerve to obturator internus and superior gemellus
Posterior femoral cutaneous nerve
Perforating cutaneous nerve
Pudendal nerve
Nerves to perineum and levator ani
