430 AKGIOLOGY. 



of the hyoid bone, passes down behind the posterior border of the 

 jaw, covered by the parotid gland, and divides into superficial 

 and deep branches ; the latter is the pterygoidean artery, which 

 passes into the pterygoid muscles, after furnishing branches to the 

 neighbouring organs ; the former is the posterior masseter, which 

 ■winds round the posterior border of the lower jaw, about the inser- 

 tion of the steruo-maxillaris. It passes into the masseter muscle, 

 -anastomosing with the masseter branch of the subzygomatic artery. 



The Posterior auricular artery springs from the posterior 

 aspect of the carotid, behind the maxillo-muscular, ascends under 

 the parotid, to the back of the base of the ear, giving off 

 numerous ascending branches ; it passes up the posterior aspect 

 of the concha between the cartilage and the skin, the terminal 

 twigs anastomosing with each other. Besides supplying the parotid 

 and retrahentes muscles, this artery gives off a large branch, 

 which divides into deep and superficial. The deejj one, after giving 

 a small twig to the middle ear, which enters by the stylo-mastoid 

 foramen, passes between the external auditory meatus and the 

 mastoid process of the temporal bone, dips into the adipose 

 tissue below the ear, and supplies the deep conchal muscles. The 

 superficial branch passes to the external side of the concha, 

 gaining the interior of the conchal cartilage, with the middle 

 auricular nerve. 



The Superficial temporal artery ascends between the parotid 

 gland, guttural pouch, and the neck of the inferior maxilla, divid- 

 ing after a short course into anterior auricular and subzygomatic 

 iDranches. The anterior auricular passes upwards to the anterior 

 aspect of the root of the ear, between the temporo-maxillary artic- 

 ulation, and the upper part of the parotid gland. After giving 

 off twigs to the temporalis muscle, and to the interior of the 

 concha and its cuticle, it is lost in the attolentes muscles. The 

 subzygomatic artery is much larger than the anterior auricular. 

 Passing under the parotid, it rounds the posterior border oi the 

 inferior maxilla just below its condyle, and then terminates by 

 two branches of nearly equal volume, the one being superior and 

 superficial, the other inferior and deep. The former is the trans- 

 verse facial, which runs under the zygomatic ridge of the anterior 

 border of the masseter, where it is lost, anastomosing with the 

 maxillo-muscular and glosso-facial arteries. The latter is the 

 masseter artery, which plunges into the substance of the masseter 

 muscle, anastomosing with the maxillo-muscular artery. 



