An envelope that changes thickness as it extends from region to region. Anatomists have broken this continuous sheath of tissue into small pieces, ignoring its continuity, and giving the same structure different names as it passes from one part of the body to the next. It is the continuity of this lubricating supportive envelope that helps us understand its function. Microscopically, fascia is composed of collagen and elastin. Collagen is arranged in tiny micro-tubules.
Form follows function.
The tubules must transport something. Blood vessels and nerves travel within the fascia to arrive at their designated end organs. In turn, fascia itself receives a profound number of nerve endings. The fascia is a fundamental structure in which the circulatory system and nervous system converge. Fascial continuity, its nervous system investments, and vascular relationships clearly demonstrate how all parts work together.