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The sacral promontory marks part of the border of the pelvic inlet, and comprises the iliopectineal line and the linea terminalis. [5] The sacral promontory articulates with the last lumbar vertebra to form the sacrovertebral angle, an angle of 30 degrees from the horizontal plane that provides a useful marker for a sling implant procedure.
The linea terminalis or innominate line consists of the pubic crest, pectineal line (pecten pubis), the arcuate line, the sacral ala, and the sacral promontory. [1]It is the pelvic brim, which is the edge of the pelvic inlet.
The pelvic brim is an approximately butterfly-shaped line passing through the prominence of the sacrum, the arcuate and pectineal lines, and the upper margin of the pubic symphysis. The pelvic brim is obtusely pointed in front, diverging on either side, and encroached upon behind by the projection forward of the promontory of the sacrum.
Extends from the pubic symphysis to the promontory; about 120 mm. Diagonal conjugate: Extends from lower margin of the pubic symphysis to the sacral promontory; about 130 mm. Straight conjugate: Extends from the lower border of the pubic symphysis to the tip of coccyx. The coccyx can bend posteriorly and expand the diameter with 25 mm;
The sacrum is curved upon itself and placed very obliquely, its base projecting forward and forming the prominent sacrovertebral angle when articulated with the last lumbar vertebra. It is also known as the "lumbosacral angle".
With the sacral promontory, it makes up the linea terminalis. [ 2 ] The Iliopectineal line divides the pelvis into the pelvis major (false pelvis) above and the pelvis minor (true pelvis) below.
The line between the closest bony points of the sacral promontory and the pubic bone next to the symphysis: 10 to 12 cm. [4] Interspinous distance Axial plane: The line between the closest bone points of the ischial spines: 9.5 to 11.5 cm. [6] Pelvic outlet Sagittal pelvic outlet diameter
The rectum follows the shape of the sacrum and ends in an expanded section called an ampulla where feces is stored before its release via the anal canal. An ampulla (from Latin bottle ) is a cavity, or the dilated end of a duct, shaped like a Roman ampulla . [ 5 ]