MYOLOGY. 53 



i 

 TRANSVERSALIS NASI. 



Runs from one internal ala of nose to the other. 

 Action. To dilate nostrils. 

 Nerve. Facial. 



ANTERIOR INTERMEDIATE. 



Origin. Facial surface of pre-maxilla above incisors. 

 Insertion. With maxillo-nasalis minor into inferior turbinated 

 bone. 



Action. Dilation of anterior nasal entrance. 

 Nerve. Facial. 



MAXILLO-LABIALIS. 



Origin. Inferior maxilla behind last molar. 

 Insertion. Skin of lower lip. 



Action. Depresses lower lip, or singly moves it laterally. 

 Nerve Facial. 



POSTERIOR INTERMEDIATE. 



Origin. Outer surface of inferior maxilla beneath incisors. 

 Insertion. Into fibers of orbicularis oris. 

 Action. Elevates lower lip. 

 Nerve. Facial. 



MASSETER. 



Origin. Zygomatic process of temporal. 

 Insertion. Outer surface of ramus of jaw. 

 Action. Elevator of jaw. 

 Nerve. Inferior maxillary of fifth. 



TEMPORAL. 



Origin. From temporal fossa, temporal fascia and outer border 

 of orbit. 



Insertion. Coronoid process and ramus of inferior maxilla. 

 Nerve. Buccal branch of fifth. 



EXTERNAL PTERYGOID. 



Origin. Under surface of sphenoid and pterygoid process. 

 Insertion. Neck of condyle of maxilla. 



Action. To pull inferior maxilla forward, alone to cause lateral 

 motion, as in grinding food. 

 Nerve. Buccal branch of fifth. 



