19^2 CIRCULATORY SYSTEM. 



muscle, and freely anastomosing with the anterior and internal 

 masseter arteries. 



7. The antehior auricular artery, arising in common 

 with the former, inclines in an opposite direction, upward and 

 backward, and is deeply seated at first under the parotid gland. 

 It ascends to the fore part of the root of the ear, and ends in 

 short ramifications to the anterior muscles of the concha, and in 

 other superficial ones which anastomose with the anterior auri- 

 cular arteries. It sends off — a. Branches to the temporal muscle. 

 b. An internal auricular brancli, which enters the concha, c. A 

 subcutaneous branch, Vvhich descends upon the forehead and anas- 

 tomoses with the supra-orbitar arteries. 



8. The intekmal maxillary artery originates deeply 

 buried on the inner side of the articulation of the jaw, a little 

 below the condyle, between the neck of the inferior maxilla and 

 the upper portion of the cornu of the os hyoides. It pursues a 

 winding course, first bending inward then downward, to the 

 bottom of the orbit, where it splits into four arteries. In its way 

 to the orbit, it gives off — a. Deep temporal branches : several 

 small arteries, variable in number, some of which run into the 

 pterygoid muscle, while others, longer ones, ascend in the space 

 behind the orbit, ramifying within the adipose matter there, and 

 penetrating the lower portion of the temporal muscle. 



b. Long slender twigs to the soft palate, to the ear, and to the 

 articulation of the jaw. 



c The inferior maxillary, a small artery of considerable 

 length, which creeps down the branch of the jaw, crossing the 

 pterygoid muscle, to enter the foramen maxillare superius in 

 company with the nerve of the same name; within which canal 

 it distributes branches to the roots of the molar teeth and to the 

 diploe, and afterwards makes its exit, greatly diminished in size, 

 through the foramen maxillare inferius, upon the side of the 

 mouth, where it becomes lost in anastomosis with the inferior 

 labial artery : in some instances, the latter artery sends a twig 

 into this hole in place of one coming out. The vessels in which 

 the internal maxillary terminates are — 



d. The supra-orbitar artery, which traverses the upper and 

 inner part of the roof of the orbit, and leaves the cavity through 

 the foramen supra-orbitarium, and is lost in slender ramifications 

 in the cellular membrane upon the forehead, anastomosing with 

 the temporal branches of the anterior auricular and the ascending 

 deep temporal arteries. 



e. The ocular, under which name are included a bunch of 

 arteries arising from the bottom of the orbit, distributed to the 

 fatty matter thereabouts, to the muscles of the globe, and to the 



