FACIAL ARTERY. 249 



OS hyoides, and is commonly within the hyoglossus muscle. 

 It gives off branches to the middle constrictors of the pharynx, 

 and to the muscles contiguous to the tongue. It also sends off 

 a branch which penetrates to the back of the tongue, which is 

 called, from its situation, Dorsalis Lingua. At the anterior 

 margin of the hyoglossus muscle it divides into two branches, 

 one of which passes to the sublingual gland and the adjacent 

 parts, and is thence called Sublingual; while the other branch, 

 the Ranina, passes by the side of the genio-glossus muscle to 

 the apex of the tongue. 



3. The Facial or External Maxillary 



Runs obliquely upwards and forwards under the ninth pair 

 of nerves the stylo-hyoideus muscle and the tendon of the 

 digastric, across the lower jaw and cheek, towards the inner 

 corner of the eye, in a serpentine course. Before it crosses the 

 jaw it sends off several branches, viz. to the pharynx, the ton- 

 sils, the inferior maxillary gland and the parts contiguous to it. 

 It also sends a branch towards the chin, which passes be- 

 tween the mylo-hyoideus, the anterior belly of the digastric, 

 and the margin of the lower jaw : and some of its branches 

 continue to the muscles of the under lip. This branch is called 

 the Submental. 



This artery then passes round the basis or inferior edge of 

 the lower jaw, very near the anterior margin of the masseter 

 muscle, and is so superficial that its pulsations can be readily 

 perceived. After this turn, its course is obliquely upwards and 

 forwards. Near the basis of the jaw it sends off a branch to 

 the masseter, which anastomoses with small branches from the 

 temporal ; and another which passes superficially to the under 

 lip and contiguous parts of the cheeks. This last is called the 

 Inferior Labial. 



After the artery has passed as high as the teeth in the lower 

 jaw, it divides into two branches; which go, one to the under, 

 and the other to the upper lip ; that to the upper lip is largest. 

 These branches are called Coronary. 



The Coronary Artery of the lower lip passes under the 



