The Muscles 93 



springs from the ventral surface of the episternum ; 

 behind, it is separated by a slight space from the 

 corresponding muscle of the other side, with which 

 it nearly covers the cervical part of the trachea. 

 Towards its anterior end it divides into two heads ; 

 one of these inserts itself on the outer border and 

 outer surface of the cornu of the hyoid ; the other 

 head, lying laterad to the former, is suddenly re- 

 duced to a short tendon by which it is attached to 

 the following muscle. 



Maxillo-coracoideiis (Mylo-hyoideus anterior, 

 Sterno-maxillare) . This muscle arises from the 

 upper border and inner surface of the caudal third 

 of the lower jaw. In its further course it becomes 

 tendinous and projects by a short tendon outwards 

 from the hyoid cornu to unite with the head of the 

 preceding muscle, as noted above ; it then becomes 

 fleshy again and is inserted on the medial part of 

 the upper border of the coracoid. 



Maxillo-hyoideus (Genio-ceratoidien, Hyomax- 

 illaris, Hyoglossus, Hyomandibularis, Mylo-hyoid- 

 eus posterior). This muscle arises, very thin, from 

 the mandibular symphysis, goes thence immedi- 

 ately backward and inward to insert itself, by its 

 broad end, on the whole anterior end of the horn 

 of the hyoid and on the hyoid itself. 



Cerato-hyoideus. Arises from the horn of the 

 hyoid and inserts itself on the body of the hyoid. 



Costo-coracoideus. This muscle arises from the 

 distal ends of the first and second ribs and is 



