Pelvic plane of greatest dimensions



pelvic plane of greatest dimensions n.
The plane extending from the middle of the posterior surface of the pubic symphysis to the junction of the second and third sacral vertebrae, passing laterally through the ischial bones over the middle of the acetabulum.

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  • Pelvic plane of inlet

    pelvic plane of inlet n. A plane that passes in front through the pubic symphysis and the pubic crest on either side, laterally by the iliopectineal lines, and in the rear by the promontory of the sacrum and is the upper opening of the small pelvis.

  • Pelvic plane of least dimensions

    pelvic plane of least dimensions n. The plane that extends from the end of the sacrum to the lower border of the pubic symphysis, bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the lower border of the pubic symphysis.



  • Pelvic plane of outlet

    pelvic plane of outlet n. An imaginary plane that passes in front through the pubic arch, laterally by the rami of the ischium and the sacrotuberous ligament on either side, and in the rear by these ligaments and the tip of the coccyx and is the lower opening of the small pelvis.

  • Pelvic pole

    pelvic pole n. The breech end of the fetus.



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