490 



THE BLOOD- VASCULAR SYSTEM. 



Relations. In the neck its origin is superficial, being covered by the integu- 

 ment, Platysma, and fascia ; it then passes beneath the Digastric and Stylo-hyoid 

 muscles and part of the submaxillary gland. It lies upon the middle constrictor 

 of the pharynx, and is separated from the Stylo-glossus and Hyo-glossus muscles 

 by a portion of the submaxillary gland. On the face, where it passes over the 

 body of the lower jaw, it is comparatively superficial, lying immediately beneath 

 the Platysma. In this situation its pulsation may be distinctly felt, and compres- 

 sion of the vessel against the bone can be effectually made. In its course over the 



Arteria septi nasi. 

 Superior coronary. 



Inferior coronary. 

 Inferior labial. 



Fm. 285. The arteries of the face and scalp. 1 



face it is covered by the integument, the fat of the cheek, and, near the angle of the 

 mouth, by the Platysma, Risorius, and Zygomatici muscles. It rests on the Buc- 

 cinator, the Levator anguli oris, and the Levator labii superioris (sometimes pierc- 

 ing or else passing under this last muscle). The facial vein lies to the outer side 

 of the artery, and takes a more direct course across the face, where it is separated 

 from the artery by a considerable interval. In the neck it lies superficial to the 

 artery. The branches of the facial nerve cross the artery, and the infra-orbital 

 nerve lies beneath it. 



The branches of this vessel may be divided into two sets : those given off below 

 the jaw (cervical), and those on the face (facial). 



1 T1 ' e rauscular tissue of the lips must be supposed to have been cut away, in order to show the 

 course ot the coronary arteries. 



