Excerpt from: http://barnesandcrackle.squarespace.com/myofascial-release/

"The Fascia is a specialized system of the body that has an appearance similar to a spider’s web or a sweater.   Fascia is very densely woven, covering and interpenetrating every muscle, bone, nerve, artery and vein as well as all of our internal organs including the heart, lungs, brain and spinal cord.  The most interesting aspect of the fascial system is that it is not just a system of separate covering.It is actually one structure that exists from head to foot without interruption.  In this way you can begin to see that each part of the entire body is connected to every other part by the fascia, like the yarn in a sweater.
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Fascia also plays an important role in the support of our bodies, since it surrounds and attaches to all structures.  These structures would not be able to provide the stability without the constant pull of the fascial system.In fact, our bones can be thought of as tent poles, which cannot support the structure without the constant support of the guide wires (or fascia) to keep an adequate amount of tension to allow the tent (or body) to remain upright with proper equilibrium."