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Ramus of the ischium


This term describes the slender, branch-like, anteroinferior projecting arm of the U-shaped ischium. This ramus joins the inferior ramus of the pubis forming the combined ischiopubic ramus. The ramus has an external or anterior surface that provides attachment for the obturator externus and part of the adductor magnus muscle. Its internal or posterior surface contributes to the lateral wall of the pelvis and perineum. The ramus has two borders, lateral and medial. The lateral border forms a sharp edge that contributes to the margin of the obturator foramen. The medial border is thick, rough and rounded. This border provides attachment for the superficial perineal fascia, the inferior fascia of the urogenital diaphragm, the transversus perinei profundus muscle, the posterior portion of the crus of the penis or clitoris, and the ischiocavernosus muscle.


The term ramus is Latin for branch.


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