Hyoid Muscle And Suprahyod Similarities

Additional to the four muscle that produce the biting and chewing movement exist the hyoid muscle ( Suprahyoid group and infrahyiod group) each group contain four muscle. The suprahyod is compose by the digastric, geniohyod, mylohyod, and stylohyod. All of them are inserted on the hyoid bone. The digastric (di=two) has two bellies, posterior and anterior belly when the hyoid if fixed from below the digastric aids in wide opening of the mouth creating an extreme opening of the mouth unlike the lateral pterygoid that acts only to opening the mouth wide. Digastric muscle is used for example when yawning or to take a large bite.