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Lateral - arcuate line on the inner surface of the ilium, and the pectineal line on the superior pubic ramus.

Posterior - sacral promontory (the superior portion of the sacrum) and sacral wings (ala).

Its size is defined by its edge, the pelvic brim. The pelvic inlet marks the boundary between the greater pelvis and lesser pelvis. The lesser pelvis is the 'true' pelvis and contains the pelvic cavity. The outer bony edges of the pelvic inlet are called the pelvic brim. The junction between the greater and lesser pelvis is known as the pelvic inlet. Within the lesser pelvis reside the pelvic cavity and pelvic viscera.

Lesser pelvis (true pelvis) - located inferiorly.

Greater pelvis (false pelvis) - located superiorly, it provides support of the lower abdominal viscera (such as the ileum and sigmoid colon).

The osteology of the pelvic girdle allows the pelvic region to be divided into two:

Contains and protects the abdominopelvic and pelvic viscera.Provides attachment for a number of muscles and ligaments used in locomotion.Transfer of weight from the upper axial skeleton to the lower appendicular components of the skeleton, especially during movement.The strong and rigid pelvis is adapted to serve a number of roles in the human body. Fig 1 - The pelvic girdle is formed by the hip bones, sacrum and coccyx. The width of the subpubic angle at the pelvic outlet can be determined by the distance between the ischial tuberosities. Here, the clinician is testing for straight side walls and measuring the bispinous diameter which is narrowest part of the pelvic canal. In addition to measuring the diagonal conjugate, a mid-pelvis check is carried out. You then use the distance between the index finger and the pubic symphysis to measure the diagonal conjugate, ideally 11cm or greater) (To do this you use the tip of your middle finger to measure the sacral promontory and then using the other hand to mark the level of the inferior margin of the pubic symphysis on the examining hand. The diagonal conjugate is the alternative, measuring from the inferior border of the pubic symphysis to the sacral promontory and can be measured manually via the vagina. However, this measurement cannot be assessed clinically, due to the presence of the bladder. This distance is between the sacral promontory and the midpoint of the pubic symphysis (where the pubic bone is thickest) and is known as the obstetric conjugate (or true conjugate). In order to determine the narrowest fixed distance that the fetus would have to negotiate, the minimum antero-posterior diameter of the pelvic inlet is measured. There are two measurements that are of importance: Obstetric Conjugate

The diameter can be determined by a pelvic examination or radiographically. It is therefore of great importance to determine the diameter of this canal and therefore the childbearing capacity of the mother. The lesser pelvis is the bony canal through which the fetus has to pass during childbirth. Clinical Relevance: Assessment of the Female Bony Pelvis