The muscular floor of the oral cavity consists of the Mylohoid, Geniohyoid, Digastric, and Stylohyoid. The mylohyoid arises bilaterally from the manidle and presents a midline raphe. The geniohyoid, lying above the mylohyoid, attaches to the mental spine of the mandible and the body of the hyoid bone. The posterior belly arises from the mastoid groove of the temporal bone. The anterior belly arises from the intermediate tendon and attaches to the mandible. The sylohyoid divides and embraces the intermediate tendon of the digastric.