Third parallel pelvic plane

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third parallel pelvic plane --> pelvic plane of least dimensions

The plane that extends from the end of the sacrum to the inferior border of the pubic symphysis; it is bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the inferior border of the pubic symphysis.

Synonym: midplane, plane of least pelvic dimensions, plane of midpelvis, third parallel pelvic plane.