Final answer:
The correct answer to what perforator veins form is (c) Venules, which are small veins that join capillaries to form larger blood vessels, leading blood back to the heart.
Step-by-step explanation:
Perforator veins are vessels that travel through the fascia connecting the superficial venous system to the deep venous system. They facilitate blood flow from the superficial veins to the deeper veins which then carry the blood back to the heart. The specific structures that perforator veins connect to are venules; after blood passes from capillaries into venules, it travels back into larger veins and then to the heart. Thus, the correct answer to what perforator veins form is (c) Venules.
Venules are extremely small veins, typically ranging from 8-100 micrometers in diameter. They play a crucial role in joining multiple capillaries that exit a capillary bed, and form part of the blood vessels that eventually lead to larger veins and back to the heart. The walls of venules comprise an endothelium, a middle layer with a few muscle cells and elastic fibers, and a thin outer layer of connective tissue fibers, known as a very thin tunica externa.
Perforator veins are vessels that travel through the fascia and form venous plexuses. Venules are extremely small veins that connect multiple capillaries exiting from a capillary bed. Multiple venules join together to form veins.