. Cunningham's Text-book of anatomy. Anatomy. genio-hyoid muscles; and also two muscles, the genioglossus and hyoglossus, which will be described along with the extrinsic muscles of the tongue. M. Digastricus.—The digastric muscle, as its name implies, possesses two bellies—anterior and posterior. The posterior belly arises under cover of the sterno-mastoid muscle from the mastoid notch medial to the mastoid process. It is directed forwards and down- wards, in company with the stylo-hyoid muscle, to end in an intermediate tendon, which is connected by a pulley-like band of cervical fascia to t
. Cunningham's Text-book of anatomy. Anatomy. genio-hyoid muscles; and also two muscles, the genioglossus and hyoglossus, which will be described along with the extrinsic muscles of the tongue. M. Digastricus.—The digastric muscle, as its name implies, possesses two bellies—anterior and posterior. The posterior belly arises under cover of the sterno-mastoid muscle from the mastoid notch medial to the mastoid process. It is directed forwards and down- wards, in company with the stylo-hyoid muscle, to end in an intermediate tendon, which is connected by a pulley-like band of cervical fascia to the body of the hyoid bone. The anterior belly of the muscle is directed forwards and upwards over the mylo-hyoid muscle to the chin, and is inserted into the oval digastric fossa on the inferior border of the mandible close to the symphysis (Eig. 410). The muscle forms the inferior boundary of the submaxillary division of the anterior triangle, containing the submaxillary gland. The posterior belly in company with the stylo-hyoid crosses the carotid arteries and internal jugular vein. The occipital artery ex- tends posteriorly along its inferior margin, and the parotid gland covers its superior border. The hypoglossal nerve emerges from under D '„ . , Superior con- COVer 01 the mUSCle. strictor (origin) The anterior belly lies upon the mylo-hyoid muscle on its way to its insertion. Nerve - Supply. — The posterior belly is supplied by the facial nerve; the anterior belly by the nerve to the mylo-hyoid, a branch of the inferior alveolar nerve. M. Stylohyoideus. —The stylo-hyoid muscle arises from the inferior border of the styloid process of the temporal bone. Crossing the anterior triangle obliquely along with the posterior belly of the digastric muscle, it is inserted into the body of the hyoid bone by two slips which enclose the tendon of the digastric muscle. Nerve-Supply.—Facial nerve. M. Mylohyoideus. — The mylo-hyoid muscle forms with its fellow a diaphragm i
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