It is a position of attachment of the anterior belly of the digastric muscle. It also contributes to the sheath of the digastric. Its path is below the posterior belly of digastric to the occipital region. Each person has a right and left digastric muscle. They are the digastric, stylohyoid, geniohyoid, and mylohyoid muscles. When the digastric muscle contracts, it acts to elevate the hyoid bone. The term "digastric muscle" refers to this specific muscle. It is perforated, near its insertion, by the intermediate tendon of the digastric muscle. The submental glands (or suprahyoid) are situated between the anterior bellies of the digastric muscle. The digastric is uniquely named for its two bellies. The mastoid notch is also referred to as the digastric groove or the digastric fossa. The posterior belly is supplied by the digastric branch of facial nerve. It contains the stylohyoid, digastric, mylohyoid, geniohyoid, omohyoid, sternohyoid, thyrohyoid and sternothyroid muscles. The digastric muscles are present in a variety of animals, specific attachment sites may vary. The digastricus (digastric muscle) consists of two muscular bellies united by an intermediate rounded tendon.