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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.
Below, it is bounded by a sharp ridge that provides attachment to a falciform prolongation of the sacrotuberous ligament, and, more anteriorly, gives origin to the transverse perineal and ischiocavernosus muscles. Posteriorly the ramus forms a large swelling, the tuberosity of the ischium, where the hamstrings originate.
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 ...
Dogs have ear mobility that allows them to rapidly pinpoint the exact location of a sound. Eighteen or more muscles can tilt, rotate, raise, or lower a dog's ear. A dog can identify a sound's location much faster than a human can, as well as hear sounds at four times the distance. [41] Dogs can lose their hearing from age or an ear infection. [42]
Lateral (side further from center): gluteal tuberosity + lip of linea aspera [1] Medial (side closer to center): sacrotuberous ligament [1] Superior (top): inferior margin of the greater sciatic notch [1] Inferior (bottom): proximal origin of hamstrings at the ischial tuberosity [1]
Similar calcification and ossification may be seen at peripheral entheseal sites, including the shoulder, iliac crest, ischial tuberosity, trochanters of the hip, tibial tuberosities, patellae, and bones of the hands and/or feet. [6] DISH can be a complicating factor when suffering from trauma involving the spine.
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.
Ischial tuberosity: Insertion: Medial condyle of tibia: Artery: Profunda femoris and gluteal arteries: Nerve: Tibial part of sciatic nerve (L5, S1 and S2) Actions: Extension of hip and flexion of knee: Antagonist: Quadriceps muscle and tensor fasciae latae: Identifiers; Latin: musculus semimembranosus: TA98: A04.7.02.036: TA2: 2642: FMA: 22438 ...
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