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The pelvic girdle is a ring-like bony structure, located in the lower part of the trunk. It connects the axial skeleton to the lower limbs. In this article, we shall look at the anatomy of the pelvic girdle – its bony landmarks, functions, and its clinical relevance.
The pelvic inlet transmits several structures between the abdomen and the pelvic cavity, including elements of the reproductive, urinary, and lower digestive systems, as well as neurovasculature. Additionally, in females, it is adapted to allow the passage of a newborn's head during childbirth.
The pelvic inlet involves three of the four elements of the bony pelvis. The pelvic brim has contributions from the first sacral segment, the ilium, and the pubis, but not the ischium. The pelvic inlet is delineated by a bony crest that defines its limit (the pelvic brim).
The true pelvis is the area between the pelvic inlet, and the pelvic outlet. In this video we go for a little tour around this area, clearly marking the boun...
The pelvic inlet or superior aperture of the pelvis is a planar surface which defines the boundary between the pelvic cavity and the abdominal cavity (or, according to some authors, between two parts of the pelvic cavity, called lesser pelvis and greater pelvis).
The pelvic inlet is oval shaped and is widest from side to side. It divides the bony pelvis into the false pelvis above (made up mainly of the ala of the ilium on each side which forms the lower lateral portion of the abdomen), and the true pelvis below (the pelvic cavity).
The abdomen is the body region found between the thorax and the pelvis. Its superior aperture faces towards the thorax, enclosed by the diaphragm. Inferiorly the abdomen is open to the pelvis, communicating through the superior pelvic aperture (pelvic inlet).
The fundamental differences in the pelvis of the two sexes are based on the shape of the pelvic inlet, the angle of the ischiopubic rami and the projection of ischial spines. The female pelvis tends to have a wider (circular) inlet, wider ischiopubic rami and shorter, blunted ischial spines.
The pelvic inlet is the anatomical limit between the false pelvis superiorly and the true pelvis inferiorly. Therefore, it is a space that marks the junction between both parts of the pelvis. The pelvic inlet is also known as the superior pelvic aperture.
Definition. The superior circumference forms the brim of the pelvis, the included space being called the pelvic inlet (superior aperture). It is formed laterally by the pectineal and arcuate lines, in front by the crests of the pubes, and behind by the anterior margin of the base of the sacrum and sacrovertebral angle.