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The Temporomandibular Joint. The TMJ, or temporomandibular joint, is the joint that connects the lower jaw to the skull. Actually, two temporomandibular joints are located just in front of the ears, one on each side of the jaw. The TMJ joint allows you to move your lower jaw so you can talk and chew.
In brief: Very common. Sure, TMJ problems can cause facial muscle spasms. It's usually the jaw muscles, on the side of the jaw (the masseter muscle) and on the side of the head or temples (the temporalis muscle) that go into spasm and cause pain from TMJ problems.