986 



THE NERVE SYSTEM 



The Meningeal or Dural Branch (n. meningeus medius) is given off from the supe- 

 rior maxillary nerve directly after its origin from the Gasserian ganglion; it accom- 

 panies the middle meningeal artery and supplies the dura of the middle fossa 

 of the base of the skull. 



The Orbital or Temporomalar Branch (n. zygomaticus) (Figs. 733 and 734) arises 

 in the sphenomaxillary fossa, enters the orbit by the sphenomaxillary fissure, 

 and divides at the back of that cavity into two branches, temporal and malar. 



The temporal branch (ramus zygomaticotemporalis) runs along the outer wall 

 of the orbit in a groove in the malar bone, receives a branch of communication 

 from the lacrimal, and, passing through a foramen in the malar bone, enters the 

 temporal fossa. It ascends between the bone and the substance of the Temporal 

 muscle, pierces this muscle and the temporal fascia about an inch above the 



Sensor root. 

 Motor root. 



Auricula-temporal 

 nerve. 



FIG. 734. Distribution of the second and third divisions of the trigeminal nerve and submaxillary ganglion. 



zygoma, and is distributed to the integument covering the temple and side of 

 the forehead, communicating with the facial and the auriculotemporal branch of 

 the inferior maxillary nerve. As it pierces the temporal fascia it gives off a slender 

 twig, which runs between the two layers of theffascia to the outer angle of the 

 orbit. The malar branch (ramus zygomaticofacialis) passes along the external 

 inferior angle of the orbit, emerges upon the face through a foramen in the malar 

 bone, and, perforating the Orbicularis palpebrarum muscte, supplies the skin 

 on the prominence of the cheek, where it is named the subcutaneus malae. It 

 joins with the facial and the palpebral branches of the superior maxillary. 



The Sphenopalatine Branches (nn. sphenopalatini (Fig. 734), two in number, 

 descend to the sphenopalatine ganglion, of which ganglion they are the sensor 

 or short roots. 



