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Position of Ischial tuberosity. Ischial tuberosity is present at the subsequent part of the ramus of Ischium which is one of the major bones of pelvic girdle. Anatomically ischial tuberosity is the puffy bony formation divided into two parts â upper and lower region.
A second line is drawn from the posterior superior iliac spine to the outer part of the ischial tuberosity; the junction of its lower with its middle third marks the point of emergence of the inferior gluteal and internal pudendal arteries from the lower part of the greater sciatic foramen.See enlarged image). A line used for clinical purposes is that of Nelaton (NÃ©laton. fig), 1243 which is drawn from the anterior superior iliac spine to the most prominent part of the ischial; tuberosity it crosses the center of the acetabulum and the upper border of the greater. trochanter