HEAD. 



loa 



the maxillary gland and the anterior straight muscle 

 of the head, reaches the anterior foramen of the atlas^ 

 runs through it into the fissure of the external surface 

 and terminates by the occipito-muscular and cerebro- 

 spinal arteries. Its collateral branches are : 



1. Prevertebkal. — Terminating by muscular and 

 meningeal branches. 



2. Mastoid. — Going to the parieto-temporal canal 

 to anastomose with the spheno-spinal. 



3. Atloido muscular. — Running backwards and 

 throus:h the atlas to anastomose with the verte- 

 bral. 



Terminal branches : Occipito muscular. — Termin- 

 ating by asceTrdrng and descending branches, the last 

 anastomosing with the superior cervical. 



Cerebro-spinal. — Penetrates the antero-internal 

 foramen of the atlas, enters the vertebral canal, and 

 terminates by two branches — one forming the basilar 

 trunk, the other the median spinal. 



Basilar trunk. — Situated on the inferior face of 

 the bulb and pons Varolii, and dividing into two 

 branches wliich give off the posterior cerebral artery. 

 It sends collateral branches to the bulb and pons Var- 

 olii, the posterior arr^s4l^r"Ki^ Ts^'efegllar arteries and 

 two^lwasciie^-tothe-mt^'ntrl cai*odT4-. 



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