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The main body of the inferior gluteal artery leaves the pelvis posteriorly to the upper border of the sacrospinous ligament, to follow the inferior portion of the sciatic nerve out of the greater sciatic foramen. [3] The main function of the ligament is to prevent rotation of the ilium past the sacrum. Laxity of this ligament and the ...
The articular surfaces are elliptical with longer transversal axes. The surface on the sacrum is convex and that on the coccyx concave. [2] Occasionally the coccyx is freely movable on the sacrum, most notably during pregnancy; in such cases a synovial membrane is present.
The sacrum has a base, an apex, and three surfaces – a pelvic, dorsal and a lateral surface. The base of the sacrum, which is broad and expanded, is directed upward and forward. On either side of the base is a large projection known as an ala of sacrum and these alae (wings) articulate with the sacroiliac joints.
Lower border of symphysis: Tip of coccyx: 9.5–10 cm Median conjugate: Lower border of symphysis: Lower border of sacrum: 11.5 cm Transverse diameter (of outlet) Between ischial tuberosities: 10–11 cm Interspinous distance: Between anterior superior iliac spines: 26 cm (female) Intercristal distance: Between furthest lateral points of iliac ...
These eminences are separated by three notches: one in front, the pubic arch, formed by the convergence of the inferior rami of the ischium and pubis on either side.; The other notches, one on either side, are formed by the sacrum and coccyx behind, the ischium in front, and the ilium above; they are called the sciatic notches; in the natural state they are converted into foramina by the ...
[3] [4] It is inserted by its base into the margin of the coccyx and into the side of the lowest piece of the sacrum. [3] [4] In combination with the levator ani, it forms the pelvic diaphragm. [5] The pudendal nerve runs between the coccygeus muscle and the piriformis muscle, superficial to the coccygeus muscle. [6]
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; about 95 mm (+ 25 mm). Median conjugate: Extends from the lower border of the pubic symphysis to the lower border of the sacrum; about 115 mm.
It runs from the sacrum (the lower transverse sacral tubercles, the inferior margins sacrum and the upper coccyx [1]) to the tuberosity of the ischium. It is a remnant of part of biceps femoris muscle. The sacrotuberous ligament is attached by its broad base to the posterior superior iliac spine, the posterior sacroiliac ligaments (with which ...
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