Boundary of pelvic inlet includes all except

Pelvic Inlet (It is also known as Superior Apeure of Pelvis) - It is an oblique plane,making an angle of 50 to 60 degrees with the horizontal bounderies - It is bounded posteriorly - By the sacral promontory, Anteriorly - By the upper margin of the pubic symphysis, and on each side or laterally - By the linea terminalis. The linea terminalis includes the anterior margin of the ala of the sacrum, the arcuate line or lower pa of the medial border of the ilium, the pectineal line of the pubis or pecten pubis, and the pubic crest. Posteriorly, the inlet is indented by the sacral promontory, more so in the male than in the female Ref : B D Chaurasia's Human Anatomy , seventh edition, volume 2 , pg. no. 399