390 



THE MUSCLE 



t, by the middle line of the neck and 

 iangle 1" Bunded above by the posterior belly of 

 A> anterior belly of the Omohyoid; the 

 /// by the anterior belly of the Digastric, 



hyoid bone to the symphysis menti, and 



belly of the Digastric and the Stylohyoi-' 

 the anterior belly of the Digastric; the care 

 the Digastric, behind by the Sterno 

 suprahyoid or submental trianp-' 

 internally by the mesal line of the 

 inf gnarly by the body of the !; oi i bone. 



Relations. By its super;!,' ,ie mastoid process, the Platysma, Sternomastoid, 



Stylohyoid muscles, and the parotid gland. By 

 ic Mylohyoid; the posterior belly on the Styloglossus, 

 js, the external carotid artery and its occipital, lingual, 

 ranches, the internal carotid artery, internal jugular vein, 



part of the Splenius, Ti- 

 lts deep surface, the an' 

 StylophaVyngeus, an' 1 

 facial, and ascem 1 

 and hypoglossal i. 



The Stylohyoid v itylohyoideus) 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 Digastric. 



HYOID BONE 



FIG. 302. Mylohyoid muscle. ( ' '' u ">-r>y.) 



Relations. By its superficial surface, above, withj 

 below, this muscle is superficial, being situated imr 

 By its deep surface, with the posterior belly of the 

 its lingual and facial branches, the Hyoglossus mi 



par. nd and deep cervical fascia; 



.o;tth the deep cervical fascia, 

 .e external carotid artery, with 

 id the luboelossal nerve. 



The Stylohyoid Ligament (ligamentum styloh 

 Stylohyoid muscle may be described .a ligarheii 

 It is a fibrous cord, often containing a little c 

 the styloid process down to the hyoid bone,.! 

 former and to the lesser cornu of the latter. , 

 and in many animals forms a distinct bom 



The Mylohyoid (m. mylohyoideus] (Fij 

 situated immediately beneath the anterior !i 

 with its fellow of the opposite side, a musci:!.j 

 It arises from the whole length of the mylol 

 from the symphysis in front to the last mol; 

 pass inward and slightly downward, to b( 



In connection with the 



, the Stylohyoid ligament. 



5 centre, which continues 



'avuiched to the tip of the 



n more or less ossified, 



i flat, triangular muscle, 



Digastric, and forming, 



the cavity of the mouth. 



' the mandible, extending 



; nd. The posterior fibres 



o the body of the hyoid 



