PHYSIOLOGY, AND PATHOLOGY OF THE CHIMPANZEE. 385 



B, In the Ptery go-maxillary Region: — 



1. Infra-orbital artery, which passes forwards to the face. It 

 supplies the incisor and canine teeth, some of the muscles of the 

 face, and the upper lip. 



2. Descending palatine artery to the soft palate, gums and 

 mucous membrane of the mouth. 



3. Pterygo-palatine artery to the roof of the pharynx, 

 sphenoidal sinus, roof of the nose, and the Eustachian tube. 



4. Spheno-palatine to the roof and outer Avail of the nose, the 

 ethmoidal cells, sphenoidal sinus, and pharnyx. 



The Ophthalmic Artery, which continues the internal carotid 

 artery beyond the carotid canal is, except for its size, similar to 

 that in Man in every way. 



The stcjwrjicial temporal artery (text-fig. 26, S.Te.A) is the 

 apparent continuation of the external carotid artery. It runs 

 upwards accompanied by tha corresponding vein and the auriculo- 

 temporal nerA'^e. It divides into two branches which supply the 

 scalp from the supra-orbital crest anteriorly to the occipital crest 

 posteriorly. 



The transverse facial artery (text-fig. 28, T.F.A) runs forwards 

 between the parotid gland superficially, and the masseter deeply, 

 supplying both by large branches. It is continued by a small 

 artery along the svirface of the zygoma. 



The occipital artery arises from the lateral aspect of the 

 external carotid soon after its origin. It passes upwards and 

 backwards, and under the cleido-mastoid it gives ofi" the posterior 

 auricular artery, which supplies the parotid gland and back of 

 the auricle. The parent stem then curA^es downwards and 

 disappears under the lateral border of the splenius capitis. 

 Under the splenius it gives ofi^ a descending branch which 

 passes downwards among the muscles of the neck and supplies 

 them by small twigs. The parent vessel then passes onwards 

 under the complexus, and supplies it and the muscles bounding 

 the sub-occipital triangle. It does not end in the scalp, nor 

 is the terminal part crossed by the sub-occipital nerve as in 

 Man. 



The branches, Avith the exception of the posterior auricular 

 artery, are distributed entirely to the muscles. No meningeal 

 arteries run from it through the anterior condyloid foramen as 

 in Man. 



The ascending pharyngeal artery (text-fig. 29 B), from the back 

 of the beginning of the external carotid runs upwards and 

 supplies the pharynx, levator palati, tensor palati, and pre- 

 vertebral muscles. It passes deep to the common carotid artery, 

 and enters the jugular foi-amen behind the nerves. It gives off 

 branches which form an arterial circle supplying the tonsils and 

 pharynx. 



The internal carotid artery is as in Man. It is accompanied 

 by several twigs from the superior cervical sympathetic ganglion. 



