Inferior portion of the central opening of the pelvis and inferior border of the true pelvis. The dimensions of this opening, in combination with that of the pelvic inlet, is critical to uncomplicated childbirth.
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pelvic inlet (Superior portion of the central opening of the pelvis and superior border of the true pelvis; ...)
pelvicephalometry (Measurement of a mother’s pelvic outlet diameter relative to the size of the fetal head.)