The pelvic inlet is the superior aperture of the pelvis. The anatomic structures that define the pelvic inlet include the sacral promontory, the superior border of the pubic symphysis and arcuate lines.
The pelvic inlet is a planar surface that determines the boundary between the pelvic cavity and the abdominal cavity.
The pubic symphysis is a joint composed of a fibrocartilaginous disc located between the left and right pubic bones.
The sacral promontory is an anterior projection of the sacral plateau, which forms the posterior margin of the pelvic inlet.
The arcuate line is a rounded border on the internal surface of the ilium, which forms the border of the pelvic inlet.
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