184 



PRACTICAL ANATOMY. 



border of anterior portion of zygoma; deep portion, 



from inferior border of zygoma. 

 Insertion Angle and external surface of the ramus 



of the inferior maxillary. 

 Nerve Inferior maxillary. 

 TEMPORAL. 



Origin Temporal fossa. 



Insertion Superior and anterior portion of coronoid 



process of inferior maxillary. 

 Nerve Inferior maxillary nerve. 



FIG. 84. PTERYGOID MUSCLES. 



1, lower head of external pterygoid ; 2, upper head of external pterygoid ; 3, internal pterygoid. 



INTERNAL PTERYGOID. 

 Origin Pterygoid fossa. 



Insertion Inner side of angle of inferior maxillary. 

 Nerve Inferior maxillary. 

 EXTERNAL PTERYGOID. 



Origin Two heads : first, pterygoid ridge and bone 

 below on great wing of sphenoid ; second, outer 

 surface of external pterygoid plate. 



