104 EQUINE ANATOMY. 



Tli^are given off behind the maxilla^r tub^cle ^an-d 

 receive the posterior communicating arterjN 



Median spinal follows the spinal marrow, back- 

 wards to its end, being supplied by branches from the 

 vertebral, intercostal, lumbar and lateral sacral. 



h. Internal carotid. — Ascends beneath the cra- 

 nium to the foramen lacerum, reaching through the 

 carotid fossa of the external surface of the sphenoid, 

 the carotid notch of the superior border, and then 

 into the cranium by a double flexure, terminates by 

 ^ke^pofete^r eo m - mii tTTcati ttg artery, which ana.yl;omQac.* 

 -wrri^ the posterior cerebral, and by a&ot - h e r branoh 

 w hich furnichca the middle and anterior cerebral. 



c. External carotid. — Continuation of the prim- 

 itive carotid, runs forward to the posterior border 

 of the long branch of the hyoid bone, passes between 

 it and the stylo-hyoideus, bends upward, and near the 

 neck of the maxillary bone divides into its terminal 

 branches — the superficial temporal and internal maxil- 

 larj. Its collateral branches are the glosso-facial, the 

 maxillo-muscular and posterior auricular. 



1. Glosso- facial. — Rises from the external carotid 

 as it passes beneath the stylo-hyoideus, turns down- 

 wards on the side of the pharynx in the intermaxillary 

 space, enters the maxillary groove, becomes superficial 

 on the anterior border of the masseter muscle, to the 



