They are the digastric, stylohyoid, geniohyoid, and mylohyoid muscles. The location of the mylohyoid dictates the spread of infection. Tonicity of the mylohyoid ridge itself can cause problems with denture retention. The mylohyoid nerve emerges to give motor supply to the mylohyoid muscle. The mylohyoid elevates the hyoid and the tongue. It contains the stylohyoid, digastric, mylohyoid, geniohyoid, omohyoid, sternohyoid, thyrohyoid and sternothyroid muscles. The mylohyoid may be imaged by CT or MRI. The mylohyoid line is at the body while the mylohyoid groove is at the ramus. The mylohyoid muscle is derived from the first pharyngeal arch. The floor is formed by the mylohyoid muscles and is occupied mainly by the tongue. The mylohyoid nerve is a branch of the inferior alveolar nerve. The mylohyoid separates the submandibular space below from the sublingual space above. The mylohyoid line is a line on the inside of the mandible. It gives off a branch, the mylohyoid nerve, and then enters the mandibular foramen.