👉 Underground veins are the network of smaller blood vessels that lie beneath the skin and within the subcutaneous tissue, close to the muscles and bones. They play a crucial role in maintaining body temperature, supplying nutrients and oxygen to tissues, and removing waste products from cells. Unlike superficial veins, they are not easily visible through the skin due to their proximity to the surface. These veins can sometimes be seen when pressure is applied to the skin or if they become inflamed, such as in varicose veins.
