Posteriorly the Superior ramus of the ischium forms a large swelling, the tuberosity of the ischium, which is divided into two portions: a lower, rough, somewhat triangular part, and an upper, smooth, quadrilateral portion.

• The lower portion is subdivided by a prominent longitudinal ridge, passing from base to apex, into two parts;
  • the outer gives attachment to the Adductor magnus,
  • the inner to the sacrotuberous ligament.

• The upper portion is subdivided into two areas by an oblique ridge, which runs downward and outward;
  • from the upper and outer area the Semimembranosus arises;
  • from the lower and inner, the long head of the Biceps femoris and the Semitendinosus.

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