Pelvic outlet
From Wikipedia, the free encyclopedia
| Bone: Pelvic outlet | |
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| Diameters of inferior aperture of lesser pelvis (female). | |
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| Muscles of the female perineum. | |
| Latin | apertura pelvis inferior |
| Gray's | subject #58 240 |
| Dorlands / Elsevier |
a_51/12144712 |
The lower circumference of the lesser pelvis is very irregular; the space enclosed by it is named the inferior aperture or pelvic outlet.
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[edit] Boundaries
It has the following boundaries:
- behind: by the point of the coccyx
- laterally: by the ischial tuberosities
[edit] Notches
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.
[edit] In situ
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.
[edit] Additional images
 Articulations of pelvis. Anterior view. |
 Articulations of pelvis. Posterior view. |
[edit] External links
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