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The sacrum (pl.: sacra or sacrums [1]), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30. [2] The sacrum situates at the upper, back part of the pelvic cavity, between the two wings of the pelvis. It forms joints with four other bones.
Sacred promontory or sacred cape or holy promontory or cape was a name assigned by the ancient Greeks and Romans to salient promontories extending into large bodies of water at strategic locations, typically containing a temple [1] to the god of the sea.
The male sacrum is long, narrow, more straight, and has a pronounced sacral promontory. The female sacrum is shorter, wider, more curved posteriorly, and has a less pronounced promontory. [13] The acetabula are wider apart in females than in males. [13] In males, the acetabulum faces more laterally, while it faces more anteriorly in females.
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".
Promontorium Sacrum or Sacrum Promontorium (Latin for "Holy Promontory") may refer to: Cap Corse, in France; Cape St. Vincent, in Portugal; Carnsore Point, in Ireland;
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;