Greater sciatic foramen

The greater ischial foramen ("large ischial hole") is an opening in the body wall in the area of the buttocks region . This hole is bounded laterally and ventrally by the large ischial bone ( Incisura ischiadica major , → ischium ). This section of bone is bounded towards the center and back (posteriomedial) by the sacrotuberous ligament , below (caudal) by the sacrospinal ligament and above by the anterior sacroiliac ligament . In humans, the greater sciatic foramen is divided into two compartments by the piriformis muscle . Above this muscle lies the suprapiriforme foramen , below the infrapiriforme foramen .

Step through the suprapiriform foramen:

Vena and superior gluteal artery
Superior gluteus nerve

Passing through the infrapiriform foramen:

Sciatic nerve

Vena and inferior gluteal artery

Inferior gluteus nerve

Posterior femoral cutaneous nerve

Pudendal nerve

Rami musculares of the sacral plexus

Internal pudendal vein and artery .

Piriformis muscle
Pathways of the lower extremity

literature

Mark Buchta et al .: Das Physikum: Gk 1-repetitorium . Elsevier, Urban & FischerVerlag 2003, ISBN 978-3-437-43050-3 , p. 143.