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Sciatic bone
Last reviewed: 06.07.2025
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The ischium (os ischii) has a thickened body (corpus ossis ischii), which complements the acetabulum from below and passes anteriorly into the branch of the ischium (ramus ossis ischu). The body of the ischium and its branch form an angle open anteriorly. In the area of the angle, the bone has a thickening - the ischial tuberosity (tuber ischiadicum). Above this tubercle, the ischial spine (spina ischiadica) extends from the posterior edge of the body, separating two notches: the lower lesser sciatic (incisura ischiadica minor) and the upper greater sciatic (incisura ischiadica major). The branch of the ischium connects with the lower branch of the pubic bone, thus closing the oval-shaped obturator foramen (foramen obturatum) from below.
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