Which terminal branch of the internal iliac artery (arteria iliaca interna) joins the trochanteric anastomosis along the neck of the femur (collum femoris)?

The terminal branch of the internal iliac artery that joins the trochanteric anastomosis along the neck of the femur is the Superior Gluteal Artery.

Here are the steps to understand this:

1. The internal iliac artery, also known as the hypogastric artery, is a major artery in the pelvic region. It supplies blood to the pelvic organs, gluteal region, and the medial compartment of the thigh.

2. This artery divides into an anterior and a posterior division. The anterior division gives rise to several branches, including the superior gluteal artery.

3. The superior gluteal artery usually is the largest branch of the anterior division of the internal iliac artery. It exits the pelvis through the greater sciatic foramen, above the piriformis muscle.

4. It then divides into a superficial branch and a deep branch. The deep branch contributes to the trochanteric anastomosis, a network of blood vessels around the neck of the femur.

5. The trochanteric anastomosis plays a crucial role in providing blood supply to the head and neck of the femur. This is particularly important in situations where the blood supply may be compromised, such as in a femoral neck fracture.