Lesser sciatic foramen
The lesser sciatic foramen is an opening (foramen) between the pelvis and the back of the thigh. The foramen is formed by the sacrotuberous ligament which runs between the sacrum and the ischial tuberosity and the sacrospinous ligament which runs between the sacrum and the ischial spine.
| Lesser sciatic foramen | |
|---|---|
 Image of the pelvis showing the lesser sciatic foramen. | |
| Details | |
| Identifiers | |
| Latin | Foramen ischiadicum minus |
| TA | A03.6.03.009 |
| FMA | 17035 |
| Anatomical terminology | |
Structure
The lesser sciatic foramen has the following boundaries:
- Anterior: the tuberosity of the ischium
- Superior: the spine of the ischium and sacrospinous ligament
- Posterior: the sacrotuberous ligament
Alternatively, the foramen can be defined by the boundaries of the lesser sciatic notch and the two ligaments.
Function
Pudendal nerve and its course through the lesser sciatic foramen.
The following pass through the foramen:
- the tendon of the Obturator internus
- internal pudendal vessels
- pudendal nerve
- nerve to the obturator internus
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See also
References
This article incorporates text in the public domain from page 309 of the 20th edition of Gray's Anatomy (1918)
External links
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Wikimedia Commons has media related to Lesser sciatic foramen. |
- Anatomy photo:41:os-0111 at the SUNY Downstate Medical Center - "The Female Perineum: Osteology"
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