Sacrospinous ligament converts greater sciatic notch into greater sciatic foramen.
Sacrotuberous ligament and sacrospinous ligament converts lesser sciatic notch into lesser sciatic foramen.
Pudendal canal is a fascial canal formed by splitting of the obturator fascia and is located on the lateral wall of ischiorectal fossa.
Structures passing thorugh greater sciatic foramen: S-SPIN-PIN
- Above pyriformis muscle: S
- Superior gluteal artery and nerve
- Below pyriformis muscle: SPIN
- Sciatic nerve
- Posterior cutaneous nerve of thigh
- Inferior gluteal artery and nerve
- Nerve to quadratus femoris
- Pudendal nerve
- Internal pudendal vessels
- Nerve to obturator internus
Structures passing through lesser sciatic foramen: PIN-T
The last 3 structures passing though the greater sciatic foramen also passes through the lesser sciatic foramen.
- Pudendal nerve
- Internal pudendal vessels
- Nerve to obturator internus
- Tendon of obturator internus
Structures passing through pudendal canal: PI
- Pudendal nerve
- Internal pudendal vessels
Excellent. From a retired urologist studying anatomy for fun!!
Thank you so much for all the work here! I’m a 3rd year medical student and it’s soo helpful.
Thank you for this! I’m a physical therapy student and this mnemonic helped me