Which anatomical structures outline Scarpa's triangle?

Scarpa's triangle, also known as the femoral triangle, is an important anatomical landmark in the thigh that is delineated by specific muscles and ligaments. The correct answer identifies the inguinal ligament, sartorius muscle, and adductor longus muscle as the structures that outline this triangular region.

The inguinal ligament runs from the anterior superior iliac spine to the pubic tubercle, forming the superior base of the triangle. The sartorius muscle, which runs diagonally across the thigh, forms the lateral boundary of Scarpa's triangle. The adductor longus, positioned medially, serves as the medial border of the triangle. Together, these three structures create a well-defined space that contains important neurovascular components, including the femoral nerve, artery, and vein.

Understanding the outline of Scarpa's triangle is essential for clinical practices such as needle placement, hernia repairs, and understanding the vascular supply to the lower limb. The other options listed do not accurately represent the boundaries of Scarpa's triangle, focusing instead on structures associated with different anatomical regions and functions.