Ischial tuberosity Anatomy The gluteus maximus, which is the broad, thick, outermost muscle of the buttocks, involved in the rotation and extension of the thigh, covers the bony growth when standing. However, the superficial muscle shifts behind it when an individual sits. The swollen structure mainly comprises of the following: Lower portion: It is rough and triangular in shape. A longitudinal ridge that passes from base to apex further divides it into two parts. The outer part offers ... The ischial tuberosity is a bony protuberance on the ischium that marks the lateral boundary of the pelvic outlet. It is involved in the attachment of several muscles and ligaments, and is often felt when sitting. Find out reasons for ischial tuberosity pain or sit bone pain, including exercises to relieve buttock pain when sitting for a long time. Discover the function and importance of the ischial tuberosity in muscle attachment and body support.
