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Chapter 9. PELVIS AND PERINEUM, PELVIS ET PERINEUM

The pelvis, pelvis is a part of human body limited by hip bones, sacrum, and coccyx; it contains genitalia and terminal parts of the gastroenteric tract and urinary tracts. The pelvic outlet is closed by several layers of soft tissues which are a special part of the body - the perineum, perineum.

The greater pelvis is formed posteriorly by the sacrum, and from the flanks - by alae of the iliac bones. The greater pelvic bones are lined with the iliopsoas muscle, m. iliopsoas which comes out upon the thigh through lacuna musculorum and attaches to the lesser trochanter of the femur. The fascial capsule of this muscle accretes with the lateral part of the inguinal ligament and arcus iliopectineus. The greater pelvis is a continuation of the abdominal cavity and contains the organs of the inferior compartment of the peritoneal cavity. In the right iliac fossa, the caecum with the vermiform process sits, in the left one - the sigmoid colon.

The place where the greater pelvis proceeds as the lesser one is at linea terminalis which limits the pelvic inlet, apertura pelvis superior. The pelvic outlet, apertura pelvis inferior is limited by the coccyx posteriorly, by sacrotuberous ligaments and ischial tuberosities laterally, and by inferior branches of pubic bones and pubic symphysis anteriorly.

WALLS OF THE LESSER PELVIS

The walls of the lesser pelvis are pubis, ilium, ischium, sacrum, and coccyx. Anteriorly pubic bones are connected by the pubic symphysis, symphysis pubica; it is supported superiorly by the superior pubic ligament, lig. pubicum superius and along the inferior border - by the arcuate pubic ligament, lig. arcuatum pubis. The sacrum and iliac bones form the sacro-iliac joint, articulatio sacroiliaca.

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