. Anatomy, descriptive and applied. Anatomy. THE >SUmAHYOn) REGION 3S9 The anterior belly {venter anterior) arises from a depression on the inner side of the lower border of the mandible, close to the symphysis, and passes downward and backward. The two bellies terminate in the central tendon which per- forates the Stylohyoid, and is held in connection with the side of the body and the greater cornu of the hyoid bone by a fibrous loop, lined with a synovial mem- brane. A broad aponeurotic layer is given off from the tendon of the Digastric on each side, which is attaciied to the body and gr
. Anatomy, descriptive and applied. Anatomy. THE >SUmAHYOn) REGION 3S9 The anterior belly {venter anterior) arises from a depression on the inner side of the lower border of the mandible, close to the symphysis, and passes downward and backward. The two bellies terminate in the central tendon which per- forates the Stylohyoid, and is held in connection with the side of the body and the greater cornu of the hyoid bone by a fibrous loop, lined with a synovial mem- brane. A broad aponeurotic layer is given off from the tendon of the Digastric on each side, which is attaciied to the body and greater cornu of the hyoid bone; this is termed the suprahyoid aponeurosis. It forms a strong layer of fascia between the anterior portions of the two muscles, and a firm investment for the other muscles of the suprahyoid region which lie deeper. Relations.—By its superficial surface, with the mastoid process, the Platysma, Sternomastoid, part of the Splenius, Trachelomastoid, and Stylohyoid muscles, and the parotid gland. By its deep surface, the anterior belly lies on the Mylohyoid; the posterior belly on the Styloglossus, Stylopharyngeus, and Hyoglossus muscles, the external carotid artery and its occipital, lingual, facial, and ascending pharyngeal branches, the internal carotid artery, internal jugular vein, and hypoglossal nerve. The Stylohyoid (m. stylohyoideus) is a small, slender muscle, lying in front of and above the posterior belly of the Digastric. It arises from the back and outer surface of the styloid process of the temporal bone, near the base; and, passing downward and forward, is inserted into the body of the hyoid bone, just at its junction with the greater cornu, and immediately above the Omohyoid. This muscle is perforated, near its insertion, by the tendon of the Fig. 300.—Mylohyoid muscle. (P. d Charpy.) Relations.—By its superficial surface, above,-viilh-the parotid gland and deep cervical fascia; below, this muscle is superficial, being
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
