560 



THE ARTERIES. 



BRANCHES OF THE FIRST OR MAXILLARY PORTION OF THE INTERNAL MAX- 

 ILLARY (Fig. 351). 



Tympanic (anterior). Small Meningeal. 



Middle Meningeal. Inferior Dental. 



The tympanic branch passes upward behind the articulation of the lower jaw, 

 enters the tympanum through the Glaserian fissure, and ramifies upon the mem- 



Incisor. 



FIG. 350 The internal maxillary artery, and its branches. 



Ptery go- Palatine. 

 Vidian. 



Descending Palatine. 

 l.-"i8ph.eno Palatine. 

 Deep Temporal. \ V^)/j 



Middle Meningeal. 

 Meningea Parva.- 

 Tympanic. 



Inferior Dental.- 



\ \ \V^ _ 



v%,. <s 



Q *? ' 

 FIG. 351. Plan of the branches. 



brana tympani, forming a vascular circle around the membrane with the stylo- 

 mastoid artery, and anastomosing with the Vidian and the tympanic branch from 

 the internal carotid. It gives off a branch (deep auricular) to the external meatus, 

 supplying its lining and the outer surface of the membrana tympani. 



The middle meningeal is the largest of the branches which supply the dura 

 mater. It arises from the internal maxillary, between the internal lateral liga- 

 ment and the neck of the jaw, and passes vertically upward between the two 

 roots of the auriculo-temporal nerve to the foramen spinosum of the sphenoid 

 bone. On entering the cranium it divides into two branches, anterior and poste- 

 rior. The anterior branch, the larger, crosses the great ala of the sphenoid, and 

 reaches the groove, or canal, in the anterior inferior angle of the parietal bone : 

 it then divides into branches which spread out between the dura mater and internal 

 surface of the cranium, some passing upward over the parietal bone as far as the 

 vertex, and others backward to the occipital bone. The posterior branch crosses 

 the squamous portion of the temporal, and on the inner surface of the parietal 



