THE MUSCLES OF THE HEAD AND NECK 129 



Nerve Supply. All supplied by the motor oculi or 

 third cranial nerve, except the external rectus, and it 

 is innervated by the abducent or sixth cranial nerve; 

 the superior oblique is supplied by the trochlear or 

 fourth cranial nerve. 



The Muscles of the Nose (Nasal Region) 



Pyramidalis nasi. Dilator naris anterior. 



Levator labii superioris Compressor nasi. 



alseque nasi. Compressor narium minor. 



Dilator naris posterior. Depressor alse nasi. 



The above muscles are just beneath the skin and 

 fascia and most of them are inserted into the skin; 

 they arise from the bones, fascia, and cartilages. 



The Muscles of the Cheeks and Lips (Maxillary 

 Region) 



Levator labii superioris. Zygoma ticus major. 

 Levator anguli oris. Zygomaticu? minor. 



The Levator Labii Superioris. Origin, lower margin 

 of orbit, some fibers from maxilla and malar bones, 

 insertion into muscular portion of upper lip. Action 

 elevates and assists in protruding the upper lip. 

 Nerve, facial. 



The Levator Anguli Oris. Origin, canine fossa of 

 maxilla; inserted into skin and fascia near angle of 

 mouth, blending with the fibers of the zygomaticus 

 major, depressor anguli oris, and orbicularis oris. 

 Action elevates angle of mouth. Nerve, facial. 



Zygomaticus Major. Origin, malar bone; inserted 

 into skin and fascia outer portion of upper lip and angle 

 of mouth, blending with the fibers of the levator 

 anguli oris, orbicularis oris, and the depressor anguli 

 oris. Action draws the angle of the mouth upward 

 and backward, as in laughing. Nerve, facial. 



