128 



Cranial Nerves. 



N. DENTAL, 

 SUPER. ANTER." 



GANGL.C?) 



BDCHDALEKM 



AN5A 5UPRA- 

 MAXILL. 



V: N. TRI&EM. 



PLEX. DENTAL.- 



472. The Second Division (Ramus supramaxillaris) of 

 the Trigeminal Xerve. 



The II. superior maxillary branch, also sensory, leaves 

 the skull through the Foramen rotundum of the sphenoid bone, crosses 

 the spheno-maxillary fossa and gives off the following branches: 



a) The orbital nerve, also called Uervus zygomaticus s. sub- 

 cutanaus malae, which enters the orbit by the spheno-maxillary fissure and 

 divides into two branches: the temporal, Hamus temporally; this receives 

 a branch of communication from the lachrymal, and passing through 

 the Camdix zyyomaticus temporalis enters the temporal fossa; at the anterior 

 border of the temporal muscle it pierces the temporal fascia, and is 

 distributed to the skin of the temple and side of the forehead ; and the 

 malar, Ham UK malar is, which passes through the Canalis syyomaticus facialis 

 to the skin of the cheek; both communicate with the JY. facial is. 



b) The s u p e r i o r dental or a 1 v e o 1 a r n e r v e, N. alveolar is 

 superior. At the Taber maxittare it divides into two branches, the first 

 of which pierces the J/". buccinator to be distributed to the mucous mem- 

 brane of the mouth ; the s e c o n d passes through a Foramen maxillare 

 super ins into the upper dental canal, and runs forwards as posterior 

 superior dental nerve to supply the mucous membrane of the 

 antrum of Highmore and the pulp of the molar teeth. Finally it commu- 

 nicates with the anterior superior dental nerve. 



c) The pterygo- or spheno-palatine nerves, short nerves 

 passing to the pterygo- or spheno-palatine ganglion. 



(\j The inf r a orb it al, Xi-run* infraorbitalis, is the direct con- 

 tinuation of the superior maxillary nerve; it passes through the infra- 

 orbital canal to the face and forms the PC'S anxeriiius minor, whose twigs 

 supply the skin of the lower eyelid, the cheek, nose and upper lip, and 

 inosculate freely with the N. facial!*. One .branch, the anterior superior 

 dental nerve, forms the Ansa supramaxillaris and the Plexus dentalis. 



