👉 A phiala or a capillary is a type of blood vessel that serves as an opening for the exchange of blood and oxygenated blood. These vessels are typically found in the skin, muscles, and organs of the body. In medical terminology, phialae refer to any small openings or veins present in the human body, which function as conduits for blood flow. They can be categorized into two main types: capillary phials (such as veins) and vein phials (such
