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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.
The body contains a prominent spine, which serves as the origin for the superior gemellus muscle. The indentation inferior to the spine is the lesser sciatic notch. Continuing down the posterior side, the ischial tuberosity is a thick, rough-surfaced prominence below the lesser sciatic notch. This is the portion that supports weight while ...
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 ...
The body forms approximately one-third of the acetabulum. The ischium forms a large swelling, the tuberosity of the ischium, also referred to colloquially as the "sit bone". When sitting, the weight is frequently placed upon the ischial tuberosity. The gluteus maximus covers it in the upright posture, but leaves it free in the seated position. [3]
ischial tuberosity [11] pes anserinus: inferior gluteal artery, perforating arteries: sciatic nerve [11] (tibial, L5, S1, S2) flexes knee, extends hip, medially rotates leg at knee [11] quadriceps femoris: 2 1 semimembranosus: Lower limb, Thigh, Posterior compartment/hamstring ischial tuberosity [11] medial surface of tibia [11] profunda ...
ischial tuberosity: medial surface of tibia: tibial part of sciatic: semimembranosus: ischial tuberosity: medial tibial condyle: tibial part of sciatic: biceps femoris - long head: ischial tuberosity: lateral side of the head of the fibula: tibial part of sciatic: biceps femoris - short head: linea aspera and lateral supracondylar line of femur
It arises by tendinous fibers from the inner and forepart of the ischial tuberosity and, running medially, is inserted into the central tendinous point of the perineum (perineal body), joining in this situation with the muscle of the opposite side, with the external anal sphincter muscle behind, and with the bulbospongiosus muscle in front.
It originates on the lateral border of the ischial tuberosity of the ischium of the pelvis. [1] From there, it passes laterally to its insertion on the posterior side of the head of the femur: the quadrate tubercle on the intertrochanteric crest and along the quadrate line, the vertical line which runs downward to bisect the lesser trochanter on the medial side of the femur.