ARE SOME PEOPLE ACTUALLY DOUBLE-JOINTED?
No. Only one joint can occur at an area where bones come together. People who can move their bones beyond normal range are able to do so because the ligaments attached to those particular bones can stretch farther than normal. Contortionists have “stretchy” ligaments, not “double joints.” A few bones are not considered a part of the bones of the skull, but are associated with them. These include the bones of the middle ear and the hyoid (HI-oid) bone. Within each middle ear cavity are three auditory bones. They aid the hearing process by transmitting vibrations from the ear drum to receptors in the inner ear (for a further discussion of this process, see chapter 12). The hyoid bone is the only bone in the body that does not attach directly to any other bone. Horseshoe-shaped, it is suspended by ligaments (cords of fibrous tissue that connects bones) from the lower portions of the temporal bones. It lies in the neck about 1 inch (2.5 centimeters) above the larynx (voice box). The hyoid
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