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From its posterior border, there extends backward a thin and pointed triangular eminence, more or less elongated in different subjects, the ischial spine, origin of the gemellus superior muscle. Above the spine is a large notch, the greater sciatic notch ; Below the spine is a smaller notch, the lesser sciatic notch .
The sacrospinous ligament (small or anterior sacrosciatic ligament) is a thin, triangular ligament in the human pelvis. The base of the ligament is attached to the outer edge of the sacrum and coccyx , and the tip of the ligament attaches to the spine of the ischium , a bony protuberance on the human pelvis .
The anal triangle can be defined either by its vertices or its sides.. Vertices. one vertex at the coccyx bone; the two ischial tuberosities of the pelvic bone; Sides. perineal membrane (posterior border of perineal membrane forms anterior border of anal triangle)
The ischial spine is part of the posterior border of the body of the ischium bone of the pelvis. It is a thin and pointed triangular eminence, more or less elongated in different subjects. It is a thin and pointed triangular eminence, more or less elongated in different subjects.
The obturator foramen is situated inferior and somewhat anterior to the acetabulum.It is bounded by the pubis bone and the ischium: superiorly by the (grooved obturator surface) of the superior ramus of pubis, inferiorly by the ramus of ischium, and laterally by (the anterior edge of) the body of ischium (including by the margin of the acetabulum).
Sacrospinous ligament and ischial spine: Insertion: Lateral margin of coccyx and related border of sacrum: Nerve: Pudendal nerve; sacral nerves: S4, S5 [1] or S3-S4 [2] Actions: Pulls coccyx forward after defecation, closing in the back part of the outlet of the pelvis: Identifiers; Latin: musculus coccygeus: TA98: A04.5.04.011: TA2: 2412: FMA ...
The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known colloquially as the sit bones or sitz bones, [1] or as a pair the sitting bones, [2] is a large posterior bony protuberance on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet.
It descends through the fibers of the psoas major, and emerges from its medial border near the brim of the pelvis. It then passes behind the common iliac arteries , and on the lateral side of the internal iliac artery and vein, and runs along the lateral wall of the lesser pelvis , above and in front of the obturator vessels , to the upper part ...