bekkeninnløpet

Bekkeninnløpet, also known as the pelvic inlet, refers to the superior aperture of the true pelvis. It is a critical anatomical landmark that delineates the boundary between the false pelvis superiorly and the true pelvis inferiorly. The shape and dimensions of the bekkeninnløpet are of significant importance, particularly in obstetrics, as they influence the passage of the fetal head during childbirth.

The bekkeninnløpet is bordered anteriorly by the pubic symphysis and the pubic crest, laterally by the arcuate line and the iliopectineal lines, and posteriorly by the sacral promontory and the anterior surface of the sacrum. Its shape is somewhat heart-shaped in females, while it tends to be more rounded in males.

The oblique diameters of the bekkeninnløpet are clinically relevant. The longest diameter is typically the oblique diameter, running from one sacroiliac joint to the contralateral iliopubic eminence. Understanding these dimensions is essential for assessing pelvic capacity and predicting potential difficulties during labor. Measurements of the bekkeninnløpet can be performed through clinical examination or imaging techniques such as X-ray pelvimetry or CT scans. Variations in its size and shape can affect the mechanics of labor and delivery.