ADAMS. PHYLOGENY OF THE JAW MVSCLES 87 



MUSCLES OF THE ADDUCTOR OR TEMPORAL OROUP 

 (TXNERVATED BY V^) 



Capiti-mandibularis superficialis. 



= Masseter. 



= Petro-tympano-maxillaris of Hoffmann. 

 Capiti-mandibularis profundus. 



= Posterior head of the temporal of others. 



= Fronto-parietal maxillaris (Post part) of Hoffmann. 

 Pterygoideus posterior. 



= Pterygoideus. 



= Pterygo-maxillaris of Hoffmann. 

 Pterygoideus anterior. 



= Anterior slip of the temporal of others. 



^Anterior part Fronto-parieto-maxillaris of Hoffmann. 



MUSCLES OF THE DEPRESSOR OR DIGASTRIC GROUP 

 iIX\ERVATED BY VII) 



Depressor mandibulae. 



MUSCLES OF THE ADDUCTOR OR TEMPORAL GROUP 

 {IXXERVATED BY Y^) 



Capiti-mandih 111 avis superficialis (C. m. s.). — This is the outer or mas- 

 seteric slip of the temporal mass, which covers over the other temporal 

 muscles. It has a double head ; the anterior arising on the large, outer 

 face of the squamosal, while the posterior head arises on the ventral part 

 of the same face. It is inserted on the outer face of the mandible on the 

 posterior half. 



Capiti-mandibularis profundus (C. m. p.). — This posterior part of the 

 temporal mass arises from the fourth cei-vical vertebra, extends around 

 over the groove on the skull, and, becoming tendinous, joins with the 

 anterior part of the muscle called pterygoideus anterior in this paper. 

 It is inserted on the coronoid region and in the fossa. 



Pterygoideus posterior (Pt. ]v). — This is a large muscle in Amphiuma, 

 arising on the pterygoid under the capiti-mandibularis superficialis. It 

 is inserted on the coronoid process, posterior to the insertion of the other 

 temporal muscles. 



Pterygoideus anterior (Pt. a.). — This is the anterior part of the muscle 

 usually called the temporal. It arises along the groove on the fronto- 

 parietal and from the orbi to-sphenoid. It extends downward, rapidly 

 converging, joins with the capiti-mandibularis profundus, and is inserted 

 vn the coronoid region of the mandible. 



