132 



THE DISTRIBUTION OF ARTERIES. 



and ramus anastomoticus (Fig \\ .5). As the internal 

 carotid enters the skull : on account of the tortuosities which 

 the vessel makes before the entrance is gained, its contents 

 cannot be too much accelerated ; nor by this contrivance can 

 rarely accidental pressure deprive the brain of its functions. 



FIG 11 



THE HEAD, WITH A PORTION OF THE LOWER JAW REMOVED, SO 

 AS TO EXPOSE THE ARTERIES BENEATH. 



1, The left carotid. 



2, The thyroideal. 



3, The laryngeal. 



4, The vertebral. 



5, The ramus anastomoticus. 



6, The internal cai'otid. 



7, External carotid. 



8, The submaxillary divided. 



9, 9, A branch sent to the cheek of 

 the horse. 



10, 10, The ranine. 



11, The mental. 



12, The internal massetei'. 



13, The ascending pharyngeal. 



a, The posterior maseeter divided. 



b, The posterior auricular. 



c, The anterior auricular. 



d, The temporal. 



The external carotid artery {Fig 11 . 7 ; Jig 12 . 1, 1) first 

 bends downwards behind the angle of the jaw {Fig 12) ; 

 then, crossing the large membranous opening of the fauces, 

 it is directed under the parotid gland towards the hindmost 

 part of the branch of the jaw. The branchings of the ex- 

 ternal carotid are : the parotideal ; the posterior and anterior 

 auricular s {Fig 11 . b, c) ; which last give off a branch to the 

 internal ear ; the temporal {Fig 9 . k ; Jig II . d); the poste- 



