Diameters
It has three principal diameters: antero-posterior (conjugate), transverse, and oblique.
| Name | Description | Average measurement in female |
| anteroposterior or conjugate diameter or conjugata vera | extends from the sacrovertebral angle (promontorium) to the pubic symphysis; | about 110 mm. |
| transverse diameter | extends across the greatest width of the superior aperture, from the middle of the brim on one side to the same point on the opposite; | about 135 mm. |
| oblique diameter | extends from the iliopectineal eminence of one side to the sacroiliac articulation of the opposite side; | about 125 mm. |
Read more about this topic: Pelvic Inlet