Sacrum is a bone, triangular in shape, fixed at the base of the spine. It makes the upper back portion of the pelvis like a slice in between two pelvic bones. The last lumbar vertebra is connected superiorly with it and the coccyx is present on the lower border of it.
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When temporomandibular joint (TMJ) is injured, a disorder of jaw muscles and nerves is developed called temporomandibular joint syndrome. The jawbone is connected to the skull by temporomandibular joint.