The ischial tuberosity has what attached to it?

• A. Inferior gemellus
• B. Quadratus femoris
• C. Semitendinosus
• D. Sacrotuberous ligament

Answer: (D)

The ischial tuberosity serves as a major anchor point for a ligament that runs from the sacrum and coccyx to the tuberosity. This sacrotuberous ligament attaches directly to the ischial tuberosity and helps stabilize the sacroiliac joint while also contributing to the boundaries of the greater and lesser sciatic foramina. Think of the tuberosity as the distal attachment point that anchors this posterior pelvic ligament, which is a key feature tested here.

For context, the tuberosity is also the origin for the hamstrings (such as the long head of the biceps femoris and the semitendinosus) and is near attachments of a few small hip muscles, but the notable structure specifically attaching to the tuberosity in this item is the sacrotuberous ligament.