Gross Anatomy · Anastomoses
The cruciate anastomosis is a vital arterial network located in the upper thigh, posterior to the femoral neck. It provides a critical collateral circulation pathway around the hip joint, ensuring blood supply to the lower limb even if the main femoral artery or its proximal branches are obstructed.
This anastomosis is formed by the convergence of four key arteries. Superiorly, it receives contributions from the inferior gluteal artery (a branch of the internal iliac artery) and the transverse branch of the lateral circumflex femoral artery (a branch of the profunda femoris artery). Inferiorly, the medial circumflex femoral artery (also a branch of the profunda femoris artery) and the first perforating artery (another branch of the profunda femoris artery) complete the network. These vessels form a cross-shaped connection, hence the term 'cruciate'.
The primary function of this anastomosis is to maintain blood flow to the lower limb, particularly the head and neck of the femur, in cases of occlusion or ligation of the femoral artery proximal to the origin of the profunda femoris artery. It connects the internal iliac system (via the inferior gluteal artery) with the femoral system (via the profunda femoris branches), providing a robust alternative route for blood supply.
The cruciate anastomosis is a crucial arterial network in the upper thigh, comprising branches from the inferior gluteal, transverse lateral circumflex femoral, medial circumflex femoral, and first perforating arteries. Its primary role is to establish collateral circulation around the hip joint, safeguarding blood supply to the lower limb, especially in scenarios involving proximal femoral artery compromise. Understanding this anastomosis is essential for appreciating the vascular resilience of the lower limb.