THE HEAD AND NECK 307 



divided at the point where it passes around the ventral 

 border of the mandible to the lateral surface of the face. 

 (e) The internal maxillary artery (a. maxillaris interna), one 

 of the two terminal branches of the external carotid, passes 

 in the direction of the orbit (p. 318), giving off the inferior 

 alveolar artery to the mandible. 

 (/) The superficial temporal artery (a. temporalis superficialis), 

 the second terminal branch, passes dorsad to the temporal 

 region, supplying the latter and the base of the ear. The 

 transverse facial artery, which crosses the cheek, is an 

 anterior branch of this vessel. 

 7. Dissection of the tongue and hyoid. 



The mylohyoideus should be reflected. Note the position 

 of the lingual nerve. 



Dorsal to the anterior part of the mylohyoideus lies the sublingual 

 gland (gl. sublingualis minor — the gl. sublingualis major is absent in the 

 rabbit*) from which several small ducts run dorsad between the geniohyoid 

 and the hyoglossus muscles to the floor of the mouth. The submaxillary duct 

 turns forward behind the sublingual gland and runs along its dorsal surface 

 to open on the floor of the mouth near the mandibular symphysis. 



(a) The stylohyoideus major muscle. Origin: Jugular process 

 of the occipital bone. Insertion: Tip of the greater corn u 

 of the hyoid. The muscle has been divided. 



The superficial temporal and internal maxillary arteries 

 should be divided. 



(b) The styloglossus. Origin: Jugular process. Insertion: 

 The muscle passes downward and forward, expanding at 

 the base of the tongue into a broad sheet, the fibres of 

 which extend to its anterior tip. 



The muscle should be carefully separated from two 

 others on its dorsomedial side and divided. 



(c) The stylohyoideus minor. Origin: Jugular process. In- 

 sertion: Lesser cornu of the hyoid. A slender muscle 

 having about the same direction, but ending on the more 

 dorsal part of the hyoid apparatus. 



*In many animals, the major sublingual gland is closely associated with the 

 anterior end of the submaxillary gland and some authors have so designated 

 the anterior lobes of the submaxillary in the rabbit. This has been denied 

 however, on the basis of critical embryological studies. 



