Final answer:
The difference between a male and female pelvis is seen in the lighter and thinner bones of the female pelvis, which is wider with a broader sciatic notch and subpubic angle greater than 80 degrees, compared to the thicker, heavier, and narrower male pelvis with a subpubic angle less than 70 degrees.
Step-by-step explanation:
To tell the difference between a male and female pelvis, there are several anatomical features to consider. The female pelvis is adapted for childbirth, so it has characteristics to accommodate this function. Some differences include:
- The bones of the female pelvis are lighter and thinner, while the male pelvis has thicker and heavier bones, as males typically have a stronger physical build.
- The sciatic notch is narrower and deeper in the male pelvis, whereas it is broader in females, facilitating the birth process.
- A female's pelvic inlet is more round or oval compared to the heart-shaped inlet of the male.
- The female has a wider and more shallow lesser pelvic cavity than the male's narrower, deeper, and tapering lesser pelvis.
- The subpubic angle in females is larger, with an angle greater than 80 degrees, compared to the male's angle which is less than 70 degrees.
This adaptation in the female pelvis to a wider structure is essential for a successful childbirth, allowing a larger space for the baby to pass through during delivery. The ischial tuberosities, which are also farther apart in females, increase the size of the pelvic outlet. Moreover, the female sacrum is wider, shorter, and less curved, which contributes to a broader pelvic inlet and lesser pelvic cavity.