Final answer:
Caput Medusae is associated with the anastomosis of superficial and deep venous systems due to portal hypertension and involves the dilatation of paraumbilical veins radiating from the umbilicus.
Step-by-step explanation:
Caput Medusae form at the anastomosis of the superficial and deep venous systems. This condition is commonly associated with portal hypertension, where the blood flow through the portal vein is obstructed, often due to liver cirrhosis. As a result, veins in the abdomen, including the paraumbilical veins, become dilated as they seek alternate pathways to return blood to the heart due to the increased resistance. The caput Medusae specifically refers to the appearance of engorged paraumbilical veins radiating from the umbilicus across the abdomen, resembling the snakes on the head of the mythical Medusa.
It's important to note that the veins you mentioned, such as the cephalic, ulnar, median antebranchial, and others, are not directly involved in the formation of Caput Medusae. Caput Medusae is more related to the condition of the vasculature within the abdominal cavity and not the extremities or superficial structures.