Roof Of Lesser Sciatic Foramen

The sacrospinous ligament forms the inferomedial border of the greater sciatic foramen.

Roof of lesser sciatic foramen.

The lesser sciatic notch is formed by the sacrotuberous ligament and the sacrospinous ligaments. Below the ischial spine is a small notch the lesser sciatic notch. The greater sciatic foramen is divided into two compartments by the piriformis muscle namely the infrapiriformic and suprapiriformic compartments below and above the muscle respectively. The lesser sciatic foramen is a small opening which provides communication between the pelvis and the gluteal region.

Identify the greater and lesser sciatic foramina and ischial spine on the pelvis shown. Lesser sciatic notch anteriorly ischial spine anterosuperiorly and ischial tuberosity anteroinferiorly sacrospinous ligament superiorly sacrotuberous ligament posteriorly. It is bounded by. It lies inferiorly to the pelvic floor.

The spine of the ischium and sacrospinous ligament posterior. The greater sciatic foramen is divided into two parts by the presence of the piriformis muscle the suprapiriform and infrapiriform foramina. It is formed by the sacrotuberous and sacrospinous ligaments. The sacrospinous ligament contributes to the superior border or roof of the lesser sciatic foramen.

The sacrospinous ligament separates the greater sciatic and lesser sciatic foramina. Tendon of obturator internus. The placement of the relatively robust sacrotuberous ligament forms the lesser sciatic foramen from the osseous lesser sciatic notch. Greater lesser sciatic foramen may 21 2018 anatomy lower limb structres passing through greater sciatic foramen structures passing through lesser sciatic foramen poonam kharb janghu advertisements.

The tuberosity of the ischium superior. Nerve to obturator internus to. Internal pudendal artery and vein n. The greater sciatic notch provides passage to many structures either above or below the piriformis muscle.

It is smooth coated in the recent state with cartilage the surface of which presents two or three ridges corresponding to the subdivisions of the tendon of the obturator internus which winds over it. A mnemonic to remember the structures passing through the lesser sciatic foramen is. The lesser sciatic foramen provides a communication between the perineum of the pelvis and the gluteal region.