380 



ARTERIES. 



spread out between the dura mater and internal surface of the cranium, some 

 passing upwards over the parietal bone as far as the vertex, and others backwards 

 to the occipital bone. The posterior branch crosses the squamous portion of the 

 temporal, and on the inner surface of the parietal bone divides into branches which 

 supply the posterior part of the dura mater and cranium. The branches of this 

 vessel are distributed to the dura mater, but chiefly to the bones; they anastomose 



Fig. 210. The Internal Maxillary Artery, and its Branches. 



IncittVt 



Fit. 211. Elan of the Branches 



with the arteries of the opposite side, and with the anterior and posterior menin- 

 geal. 



The middle meningeal, on entering the cranium, gives off the following colla- 

 teral branches: 1. Numerous small vessels to the ganglion of the fifth nerve, 

 and to the dura mater in this situation. 2. A branch to the facial nerve, which 

 enters the hiatus Fallopii, supplies the facial nerve, and anastomoses with the stylo- 

 mastoid branch of the posterior auricular artery. 3. Orbital branches, which 

 pass through the sphenoid al fissure, or through separate canals in the great wing 

 of the sphenoid, to anastomose with the lachrymal or other branches of the oph- 

 thalmic artery. 4. Temporal branches, which pass through foramina in the great 

 wing of the sphenoid, and anastomose in the temporal fossa with the deep temporal 

 arteries. 



The small meningeal is sometimes derived from the preceding. It enters the 

 skull through the foramen ovale, and supplies the Casserian ganglion and dura 



