What bones make up the bony pelvis?

The bony pelvis is formed by two hip bones on the sides, and the sacrum and coccyx at the back.

What are the main joints of the bony pelvis?

The pelvis has two synovial sacroiliac joints and two fibrocartilaginous joints: the pubic symphysis and sacrococcygeal joint.

What is the difference between the greater and lesser pelvis?

The greater pelvis is above the pelvic brim and supports abdominal organs. The lesser pelvis is below the brim and forms the birth canal in females.

What marks the boundary between the greater and lesser pelvis?

The pelvic brim separates them, defined posteriorly by the sacral promontory, anteriorly by the upper pubic symphysis, and laterally by structures like the arcuate line.

How does the male and female pelvis differ?

Key differences include the pelvic inlet being heart-shaped in males and oval in females, the true pelvis being narrow in males and roomy in females, and the subpubic angle being smaller in males.

What is the anatomical position of the bony pelvis?

In an erect posture, the ASIS (anterior superior iliac spine) and the top of the pubic symphysis align in the same vertical coronal plane.

What structures form the pelvic outlet?

The pelvic outlet boundaries are anteriorly the pubic symphysis, posteriorly the coccyx, and laterally structures like the ischiopubic rami and ischial tuberosities.

Bony Pelvis – Structure, Joints & Sex Differences

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