Pelvic outlet
Appearance
(Redirected from Inferior aperture of the pelvis)
Pelvic outlet | |
---|---|
![]() Diameters of inferior aperture of lesser pelvis (female) | |
![]() Muscles of the female perineum | |
Details | |
Identifiers | |
Latin | apertura pelvis inferior |
TA98 | A02.5.02.009 |
TA2 | 1290 |
FMA | 17273 |
Anatomical terms of bone |
The lower circumference of the lesser pelvis is very irregular; the space enclosed by it is named the inferior aperture or pelvic outlet. It is an important component of pelvimetry.
Boundaries
[edit]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.[1]
Notches
[edit]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.
In situ
[edit]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.
See also
[edit]Additional images
[edit]-
Articulations of pelvis. Anterior view.
-
Articulations of pelvis. Posterior view.
-
Low-dose CT scan of sagittal pelvic outlet diameter as part of pelvimetry
-
Intertuberous diameter, as a measure of the transverse measure of the pelvic outlet
References
[edit]- ^ Sara Paterson-Brown, Phillip Bennett, Catherine Williamson (2010). Basic Science in Obstetrics and Gynaecology (Fourth Edition) - Obstetric pelvic definitions and dimensions. Elsevier Ltd. ISBN 978-0-443-10281-3.
{{cite book}}
: CS1 maint: multiple names: authors list (link)
External links
[edit]- pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (medialpelvissmall, malepelvissagittalinlet&outletsml)