MRCS 1 ANATOMY GENERAL

Question 1

greater sciatic foramen BORDERS

Answer 1

The greater sciatic foramen provides a passageway for structures to pass from the pelvis into the gluteal region.
The greater sciatic foramen is bordered by:

Superior – anterior sacroiliac ligament
Posteromedial – sacrotuberous ligament
Anterolateral – greater sciatic notch of the ilium
Inferior – sacrospinous ligament and ischial spine

Question 2

GREATED SCIATIC FORAMEN Contents

Answer 2

Contents
The greater sciatic foramen is divided into two parts by the presence of the piriformis muscle – the suprapiriform and infrapiriform foramina.

Suprapiriform foramen:
Superior gluteal artery and vein
Superior gluteal nerve
Infrapiriform foramen:
Sciatic nerve
Pudendal nerve
Inferior gluteal artery and vein
Inferior gluteal nerve
Posterior femoral cutaneous nerve
Nerve to obturator internus
Nerve to quadratus femoris

Question 3

Lesser Sciatic Foramen BORDERS

Answer 3

The lesser sciatic foramen provides a communication between the perineum of the pelvis and the gluteal region. It lies inferiorly to the pelvic floor.

Borders
The lesser sciatic foramen is bordered by:
Superior – sacrospinous ligament and ischial spine
Anterior – ischial spine, lesser sciatic notch and ischial tuberosity
Posterior – sacrotuberous ligament

Question 4

Lesser Sciatic Foramen CONTENT

Answer 4

Internal pudendal artery and vein
Pudendal nerve (note the pudendal nerve first leaves the pelvis via the greater sciatic foramen, and then re-enters via the lesser sciatic foramen)
Obturator internus tendon
Nerve to obturator internus