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Pelvic inlet
From Wikipedia, the free encyclopedia
(Redirected from Superior circumference)
| Bone: Pelvic inlet | ||
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| 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.
Contents |
It is formed as follows:
| in front by the pubic crest (or pubic symphysis) |
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| 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) |
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. |
 Pelvis |
- 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)
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| 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 |