The Muscles 91 



Pterygo-maxillaris (Pterygoideus) (Pterygoid- 

 ien, Aeusser Fliigelmuskel, Pterygoideus extern us, 

 Pterygoideus intemus). A large muscle which 

 consists of two portions: the outer, weaker portion 

 springs from the pterygoid process, the inner 

 stronger part from the pterygoid fossa and ptery- 

 goid process; they run together around the angle 

 of the lower jaw, where they form a large, bulging 

 fold. They are the chief muscles of this part of the 

 body since the masseter is lacking and the tempo- 

 ralis is weakly developed. 



Occipito-maxillaris (Digastncus maxillce) (Nie- 

 derzieher des Unterkiefers, Abaisseur ou 1' analogue 

 du digastrique, Senker des Unterkiefers, Aristotelis 

 apertor oris, Digastncus, Aperator oris). Arises 

 from the hinder border of the lateral occipital and 

 is inserted at the hinder end of the lower jaw. 

 Its course is from front to back. If the skull be 

 stationary this muscle drops the lower jaw; if the 

 jaw be fixed it raises the skull. 



Muscles of the Ventral Surface of the 



Neck 



Intermaxillaris and Sphincter Colli (Intermax- 

 illaire, Mylo-hyoideus, Zwischenkiefermuskel, La- 

 tissimus colli). This muscle consists chiefly of 

 transversely running fibers, and has in its middle 

 third a small, median, longitudinal raphe or apo- 

 neurosis. In the posterior part of the neck it 



