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Re: Discovery tonight ... 8 pm

 (they made the ever-so-popular error of indicating that snakes
 "unhinge" their jaws - and they were not talking about the mandibular

As Skitt's Law would have it, it's _symphysis_...

But to repeat your point, the mandibular symphysis of snakes isn't a synovial joint (with smooth cartilage surfaces and a joint capsule and all that stuff). It's just two bones and a ligament that can stretch, something synovial joints are practically incapable of.