The pelvic brim is the edge of the pelvic inlet. It is an approximately apple-shaped line passing through the prominence of the sacrum, the arcuate and pectineal lines, and the upper margin of the pubic symphysis.
The pelvic brim is somewhat apple-shaped, obtusely pointed in front, diverging on either side, and encroached upon behind by the projection forward of the promontory of the sacrum.
The oblique plane passing approximately through the pelvic brim divides the internal part of the pelvis (pelvic cavity) into the false or greater pelvis and the true or lesser pelvis. The false pelvis, which is above that plane, is sometimes considered to be a part of the abdominal cavity, rather than a part of the pelvic cavity (see also Abdomen). In this case, the pelvic cavity coincides with the true pelvis, which is below the above-mentioned plane.
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Famous quotes containing the word brim:
“An oblong puddle inset in the coarse asphalt; like a fancy footprint filled to the brim with quicksilver; like a spatulate hole through which you can see the nether sky. Surrounded, I note, by a diffuse tentacled black dampness where some dull dun dead leaves have stuck. Drowned, I should say, before the puddle had shrunk to its present size.”
—Vladimir Nabokov (1899–1977)