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-coracoideus (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 
