Pelvic outlet

It has the following boundaries:

• anteriorly: the pubic arch
• laterally: the ischial tuberosities
• posterolaterally: the inferior margin of the sacrotuberous ligament
• posteriorly: the anterior border of the middle of the coccyx.{{cite book|isbn=978-0-443-10281-3|year=2010|publisher=Elsevier Ltd|author=Sara Paterson-Brown, Phillip Bennett, Catherine Williamson|title=Basic Science in Obstetrics and Gynaecology (Fourth Edition) - Obstetric pelvic definitions and dimensions}}

These eminences are separated by three notches:

• one in front, the pubic arch, formed by the convergence of the inferior rami of the ischium and pubis on either side.
• The other notches, one on either side, are formed by the sacrum and coccyx behind, the ischium in front, and the ilium above; they are called the sciatic notches; in the natural state they are converted into foramina by the sacrotuberous and sacrospinous ligaments.

When the ligaments are in situ, the inferior aperture of the pelvis is lozenge-shaped, bounded as follows:

• in front, by the pubic arcuate ligament and the inferior rami of the pubes and ischia
• laterally, by the ischial tuberosities
• behind, by the sacrotuberous ligaments and the tip of the coccyx.

• Pelvic inlet

File:Gray319.png|Articulations of pelvis. Anterior view.

File:Gray320.png|Articulations of pelvis. Posterior view.

File:Low-dose CT of sagittal pelvic outlet diameter.jpg|Low-dose CT scan of sagittal pelvic outlet diameter as part of pelvimetry

File:Low-dose CT scan of intertuberous diameter.jpg|Intertuberous diameter, as a measure of the transverse measure of the pelvic outlet

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• {{NormanAnatomy|pelvis}} ({{NormanAnatomyFig|medialpelvissmall}}, {{NormanAnatomyFig|malepelvissagittalinlet&outletsml}})

{{Pelvis}}

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Category:Pelvis