These are three in number, two cartilaginous and one synovial. The cartilaginous or amphiarthrodial joints are formed by the union of the superior extremity of the long horn of the hyoid bone with the petrous temporal bone, and the inferior extremity of the same with the superior extremity of the short horn. The synovial articulation exists between the lower end of the short horn and the body of the bone. See fig. 291, p. 189.