68 A MANUAL OF ANATOMY. 



The Mental, Infra-orbital and Supra-orbital Foramina. 

 Figs. 3, 4, ii. 



The mental foramen is in the lower jaw, in a line with the 

 supra-orbital and infra-orbital foramina. Through it come 

 the mental nerve and artery (branches from the inferior 

 dental nerve and artery, and these arise in turn from the 

 inferior maxillary nerve and internal maxillary artery). 



The supra-orbital foramen transmits the artery, vein, and 

 nerve of this name. The artery is a branch of the ophthal- 

 mic, the nerve of the frontal, which arises from the ophthal- 

 mic. The vein empties into the ophthalmic, an important 

 connection to remember. 



The infra-orbital foramen transmits the artery, vein, and 

 nerve of the same name. The artery is a branch from the 

 internal maxillary, the vein empties into the internal max- 

 illary vein, and the nerve is the termination of the superior 

 maxillary nerve. 



These three foramina a're in the same line, and the nerves 

 which come through them are sensory branches of the three 

 trunks of the fifth cranial nerve. 



THE NECK, Anterior. 

 THE LANDMARKS. Figs. 14, 15. 



The region of the neck is limited above by the lower 

 jaw, mastoid process, and a line joining them, and the su- 

 perior curved line of the occipital bone ; below, by the top 

 of the sternum and clavicle ; laterally, by the linear ele- 

 vation formed by the anterior borders of the trapezius 

 muscles. 



This area is divided in front by the median line into two 

 symmetrical portions. 



The above boundaries should be identified. 



