Pelvic inlet
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| Bone: Pelvic inlet | |
|---|---|
 | |
| Diameters of superior aperture of lesser pelvis (female). | |
| Latin | apertura pelvis superior |
| Gray's | subject #58 239 |
| Dorlands / Elsevier | a_51/12144724 |
The superior circumference of the lesser pelvis forms the brim of the pelvis, the included space being called the superior aperture or pelvic inlet.
The superior aperture is somewhat heart-shaped, obtusely pointed in front, diverging on either side, and encroached upon behind by the projection forward of the promontory of the sacrum.
The edge of the inlet is known as the pelvic brim. Occasionally, the terms are used interchangeably.
Boundaries
It is formed as follows:
| in front by the pubic crest (or pubic symphysis) | ||
| laterally by the pectineal line (or iliopectineal line) and arcuate lines | (same as other side) | |
| behind by the anterior margin of the base of the sacrum (or the ala of sacrum) and sacrovertebral angle (or sacral promontory) |
Diameters
It has three principal diameters: antero-posterior, transverse, and oblique.
| Name | Description | Average measurement in female |
| anteroposterior or conjugate diameter | extends from the sacrovertebral angle (promontorium) to the symphysis pubis; | about 110 mm. |
| transverse diameter | extends across the greatest width of the superior aperture, from the middle of the brim on one side to the same point on the opposite; | about 135 mm. |
| oblique diameter | extends from the iliopectineal eminence of one side to the sacroiliac articulation of the opposite side; | about 125 mm. |
Additional images
 Pelvis |
External links
- SUNY Anatomy Image 9951
- SUNY Anatomy Image 9950 - transverse diameter is blue pipecleaner, anteroposterior or conjugate diameter is red pipecleaner
- Image at mun.ca
- Norman/Georgetown pelvis (medialpelvissmall, malepelvissagittalinlet&outletsml)
Bones of pelvis/pelvic cavity | |
|---|---|
| General | sacrum, coccyx, hip bone |
| Ilium | Body (Arcuate line) Wing: gluteal lines (Posterior, Anterior, Inferior) - Fossa - iliac spines (Anterior superior, Anterior inferior, Posterior superior, Posterior inferior) - Crest - Tuberosity |
| Ischium | Body (Ischial spine, Lesser sciatic notch) - Superior ramus (Tuberosity of the ischium) - Inferior ramus |
| Pubis | Body - Superior ramus (Pubic tubercle, Pubic crest, Obturator crest) - Inferior ramus (Pectineal line) |
| Compound | Acetabulum (Acetabular notch) - Iliopubic eminence/Iliopectineal line - Linea terminalis - Ischiopubic ramus/Pubic arch
Obturator foramen - Greater sciatic foramen/Greater sciatic notch - Lesser sciatic foramen Lesser pelvis (Pelvic inlet, Pelvic brim, Pelvic outlet) - Greater pelvis |
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
