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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 line between the closest bone points of the ischial spines: 9.5 to 11.5 cm. [6] Pelvic outlet Sagittal pelvic outlet diameter Same, but may require minor side-to-side scrolling to visualize both end points. The closest bony points of the sacrococcygeal joint and the pubic bone next to the symphysis.
The pelvic cavity also contains major arteries, veins, muscles, and nerves. These structures coexist in a crowded space, and disorders of one pelvic component may impact upon another; for example, constipation may overload the rectum and compress the urinary bladder, or childbirth might damage the pudendal nerves and later lead to anal weakness.
The ischium is the strongest of the three regions that form the hip bone. It is divisible into three portions: the body, the superior ramus, and the inferior ramus. The body forms approximately one-third of the acetabulum. The ischium forms a large swelling, the tuberosity of the ischium, also referred
The Thinker by Auguste Rodin. Sitting is a basic action and resting position in which the body weight is supported primarily by the bony ischial tuberosities with the buttocks in contact with the ground or a horizontal surface such as a chair seat, instead of by the lower limbs as in standing, squatting or kneeling.
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.
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)
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 ...