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Ischial tuberosity
Bones used to sit / From Wikipedia, the free encyclopedia
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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.
Quick Facts Details, Identifiers ...
Ischial tuberosity | |
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![]() Capsule of hip-joint (distended). Posterior aspect. (Ischial tuberosity visible at bottom left.) | |
Details | |
Identifiers | |
Latin | tuber ischiadicum, tuberositas ischiadica |
TA98 | A02.5.01.204 |
TA2 | 1342 |
FMA | 17010 |
Anatomical terms of bone |
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When sitting, the weight is frequently placed upon the ischial tuberosity.[3] The gluteus maximus provides cover in the upright posture, but leaves it free in the seated position.[4] The distance between a cyclist's ischial tuberosities is one of the factors in the choice of a bicycle saddle.