Fascia is a layer of fibrous, connective tissue that surrounds individual and groups of muscles, blood vessels, nerves, and other structures. It binds some structures together, while permitting others to slide smoothly over each other.
Various types of fascia have been classified according to their distinct layers, their functions and their anatomical location:
- superficial fascia: found below the skin and above the muscles
- deep (or muscle) fascia: dense fibrous connective tissue that interpenetrates and surrounds the muscles, bones, nerves and blood vessels of the body
- visceral (or parietal) fascia: suspends the organs, wrapping them in layers of membranes
Fascia is dense regular connective tissue containing tight bundles of collagen fibers oriented in wavy patterns parallel to the direction of pull, making it a flexible structure. It is able to resist great unidirectional tension forces until the pattern has been straightened out by the pulling forces.
These collagen fibers are produced by cells called fibroblasts located within the fascia, capable of producing contraction of a previously believed ‘non-contractile’ tissue