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Synovia

Joint example with synovial cavity, source Madhero88 for Wikipedia.

Synovia – also synovial fluid or joint fluid – is a viscous, stringy, clear body fluid found in real joints. It is built by the membrana synovialis, the inner membrane of the joint capsule. It generates a lubricating film on top of the joint surfaces. The term leads back to Paracelsus and derives from the Greek syn for “together with” and with ovia for “protein”. The synovia is responsible for the nutrition of the joint cartilage, for the lubrication of the joint and – together with joint cartilage – for the shock and stress absorption in the joint.

 

The exchange of liquids and hence the nutritional supply of the joint cartilage is maintained by physiological joint movement (alternating load and relief of the joint). Overstressing of the joint – as well as long-term immobilization – lead to nutritional disturbances and cartilage defects.