HEAD AND NECK OF THE HORSE 



13 



distance parallel to the external maxillary vein on the surface of the 

 internal pterygoid muscle, but soon the duct and vein come into 

 contact : the duct being ventral to the vein, and the vein ventral to the 

 external maxillary artery. The three structures maintain this relative 

 position as they turn round the margin of the mandible. 



The termination of the parotid duct will be examined in connection 

 with the cheek. 



Lymph glands.' 



M. omohyoideus — 



Lig. cricotracheale. 



Parotid gland. 



Branch of 2nd ^ 



cervical nerve. 



M. sternocephalicus. 



-M. mylohyoideus. 

 -M. digastricus. 



A. maxillaris 



interna. 

 Mm. sternohyoideus. 



et omohyoideus. 



Parotid duct. 



•-Hyoid bone. 



- M. thyreohyoideus. 

 Membrana 



- hyothyreoidea. 

 _V. maxillaris 



externa. 

 " M. cricothyreoideus. 



.. M. sterno- 



thyreoideus. 

 ..1st tracheal 



cartilage. 



— M. omohyoideus. 



fr\ M. sternohyoideus. 



M. sternocephalicus. 



Fig. 4. — Dissection of the laryngeal region. First (left) and second (right) stages. 



M. DIGASTRICUS. — As its name indicates, the digastric ^ muscle 

 possesses two fleshy bellies joined by an intermediate tendon. At the 

 present time it is possible to see the strong anterior belly only. This is 

 inserted to the medial surface of the mandible close to the lower border 

 of the molar part of this bone. 



M. MYLOGLOSSUS. — The pale, thin mylo-glossal - muscle consists of 

 transverse fibres springing from the medial surface of the mandible, 

 close to the alveolar border, frojn the symphysis to the third or fourth 



^ 3is (dis) [Gr.], double, yaffrrjp (gaster) [Gr.], belh^ 



- /xtiXrj (myle) [Gr.], a mill ; referring to the cheek teeth. yXQaffa (glossa) [Gr.], 

 the tongue. 



