Which pelvic diameter is widest at the pelvic outlet?

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Multiple Choice

Which pelvic diameter is widest at the pelvic outlet?

Explanation:
The widest dimension at the pelvic outlet is the transverse diameter. This is the side-to-side distance between the two ischial tuberosities, and it typically measures about 11 cm. That plane is naturally the broadest opening in the outlet, making it the most accommodating dimension for the fetal head to pass through. The front-to-back (anteroposterior) diameter is shorter—measured from the pubic symphysis to the coccyx—so it doesn’t provide as wide a passage as the transverse dimension. The vertical diameter relates to pelvis height, not the widest outlet plane, and oblique diameters are measurements that apply more to other pelvic dimensions (like the inlet or diagonal measurements) rather than the outlet’s widest cross-section.

The widest dimension at the pelvic outlet is the transverse diameter. This is the side-to-side distance between the two ischial tuberosities, and it typically measures about 11 cm. That plane is naturally the broadest opening in the outlet, making it the most accommodating dimension for the fetal head to pass through.

The front-to-back (anteroposterior) diameter is shorter—measured from the pubic symphysis to the coccyx—so it doesn’t provide as wide a passage as the transverse dimension. The vertical diameter relates to pelvis height, not the widest outlet plane, and oblique diameters are measurements that apply more to other pelvic dimensions (like the inlet or diagonal measurements) rather than the outlet’s widest cross-section.

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