FIFTH PAIR TRIFACIAL NERVES. 



495 



rior, middle, and inferior, are distributed to the nose, false nostril, 

 upper lip, and muscles and integument of the face, and form 

 intimate plexuses with branches of the seventh pair or facial 

 motor nerves. 



The Inferior maxillary nerve, the largest of the three 

 divisions of the fifth, unites with the anterior root of the nerve 

 immediately after it passes through the oval opening in the dura 

 mater, so that it is both sensory and motor. The course of this 

 nerve is through the foramen lacerum basis cranii, and between 



Fig. 187. 

 Nerves of the right side of the head— the maxillary ramus and cheek being rensoved. a, Superior 

 maxillary branch of fifth ; a', Spheno-palatine ; 6, Orbital ; c. Branch of spheno-palatine ; d. Pala- 

 tine : e, Superior dental ; /, Staphyline : o, Superior maxillary trunk entering infraorbital foramen ; 

 g', Superior : g". Middle ; g"'. Inferior nasal nerves : li. Inferior maxillary branch of fifth ; 

 i, Masseter ; k, Anterior deep temporal : I, Pterygoid ; m. Buccal ; b, Subzygomatic ; o. Inferior 

 dental; o', Mental : p. Lingual ; p', Its superficial ; p". Its deep branch. 



the pterygoid muscles, to the inferior dental foramen, which it 

 enters, and, passing through the lower jaw, makes its exit at the 

 anterior maxillary or mental foramen, and terminates in the 

 mental nerves. In its course it gives off masseter, buccal, internal 

 pterygoidean, subzygomatic, lingual, mylo-hyoidean, and dental 

 branches. 



The masseter branch is detached from the trunk at the base of 

 the cranium, passing through the sigmoid notch in front of the 



