448 ANGIOLOGY. 



and the alveoli of the upper molars ; its anterior extremity opens 

 into the facial vein ; posteriorly it crosses the alveolar tuberosity, 

 and passes through the optic fossa, receiving the superior dental, 

 spheno-palatine, palatine, and staphyline veins ; in the ocular 

 sheath, it receives the veins from the eye. By the side of the 

 ophthalmic nerve, it enters the cranium by the foramen lacerum 

 orbitale, and communicates with the cavernous sinus at the base 

 of the brain. Before this vein winds round the alveolar tuber- 



FIG. 16S. 



Veins of the face and neck. 1, Glosso-facial ; A, Its facial portion ; 2, Jugular ; 3, Occipital: 

 4, Cervical portion of jugular ; a, Superior coronary ; b, Small labial branch : c, Inferior coronary; 

 a' , Common coronary trunk ; d, Angular vein of the eye ; e, Dorsal nasal ; c', Lateral nasal ; 

 /, Alveolar; g, Buccal ; h, Posterior auricular; i, Superficial temporal; k, Anterior auricular, 

 I, Subzygomatic ; m, Superior cerebral cut ; n, Maxillo muscular; o o o, Muscular, oesophageal, 

 and tracheal twigs. 



osity, it forms a large venous reservoir, which diminishes before 

 entering the ocular sheath. The use of this reservoir is appar- 

 ently to prevent congestion in the cavernous sinuses. 



The superior and . inferior coronary veins are the next 

 branches, and sometimes they unite to form a common trunk. 

 The superior gives off a small labial branch. 



