108 EQUINE ANATOMY, 



arterial trank with two principal roots, the anterior 

 auricular and the sub -zygomatic. 



2. Internal maxillary. — Supplied by the buccal 

 vein. It receives numerous collateral branches, viz : 

 the lingual, inferior dental, a deep temporal trunk and 

 a pterygoid. 



3. Cephalic sinuses of the dura mater. — Four 

 principal : the sinuses of the falx cerebri, the cavern- 

 ous or sphenoidal, the occipito-atloid and the rudiment- 

 ary sinuses, divided into lateral and inferior median. 

 These sinuses are supplied from the dura mater or from 

 nervous substance ; some of the last are superficial, 

 the others, internal, are provided by the great vein of 

 the brain or vena G-aleni. All the sinuses collect through 

 the means of the parieto-temporal and subsphenoidal 

 confluents, and empty into the temporal, pterygoid and 

 occipital veins. 



Other veins of the head considered as affluents of 

 the jugular, are : 1 — the maxillo-muscular ; 2 — the 

 posterior auricular ; 3 — the occipital ; 4 — the external 

 maxillary or glosso-facial, formed by the angular of 

 the eye and another small branch, by the alveolar, 

 labial or coronary, buccal and sublingual as collateral 

 branches. 



LymphaticSi— Two groups: 1 — The pharyngeal, sit- 

 uated on the lateral sides of the pharynx below the 



