Composition of the pelvis - skeletal structure of the pelvis - male and female pelvic models

  The pelvis is a complete bone ring connected by the posterior sacrum, tailbone (the two lowest bones of the spine) and the left and right hip bones. The pelvis not only transfers weight to the two lower limbs, but also serves as the activity base of the free lower limbs and supports and protects the abdominal pelvic organs.

        Between the sacrum, iliac bone and sacrum and tailbone, there are strong ligaments supporting the connection, forming joints, generally immobile, after pregnancy under the influence of hormones, ligaments slightly relaxed, each joint is slightly loosened, which is beneficial to childbirth.

        The entire pelvic boundary is divided into a large upper pelvis (false pelvis) and a small lower pelvis (true pelvis). The boundary is a circular line formed by the sacral promonium, the anterior edge of the bilateral sacral pterygoid, the bilateral arcuate line, the bilateral pubic comb, the pubic tubercle, the pubic ridge and the upper margin of the pubic union, that is, the upper mouth of the small pelvis, through which the large and small pelvis communicate. The lower opening of the small pelvis is uneven in height, and is composed of the coccygeal tip, the sacrotuberous ligament on both sides, the ischial tubercle, the pubic arch, and the lower margin of the pubic symphysis. Between the upper and lower mouth is the pelvic cavity.