Anterior Inferior Iliac Spine
The structure indicated is the anterior inferior iliac spine of the pelvic bone.
The pelvic bones consist of three parts:
- Ilium
- Ischium
- Pubis
The anterior part of the ilium consists of two bony spines. Superiorly is the anterior superior iliac spine (ASIS), and inferiorly is the anterior inferior iliac spine. Posteriorly is the posterior superior iliac spine and the posterior inferior iliac spine.
The rectus femoris muscle of the quadriceps group of thigh muscles attaches to the anterior inferior iliac spine, as well as the iliofemoral ligament.
Learn more about the anatomy of the pelvic bones in this anatomy tutorial.