INTERNAL CAROTID 



497 



branches, which run upwards and forwards, <rivin^ small twigs to the mucous 

 mcmlirane covering the upi^er part of the sejttum, and which pass through the 

 criliriform plate of the etlnnoid, and anastomose with the ethmoidal arteries 

 (perforating or meningeal branches). 



THE INTERNAL CAROTID ARTERY 



The internal carotid (fig. 338) arises with the external carotid at the bifurca- 

 tion of the common rarotid, opposite the upper border of the thyroi<l cartilage, on a 

 level with the fourth cervical vertebra. It is at first placed a little external to the 



Fici. 338. — The Ixterxal Carotid Artery, axp Deep Braxches of the Extekxal 



Carotid Arterv, Left Side. 



(From a dissection in the Hunterian Museum.) 



External carotid artei-tj, cut 

 Temporal artery 



Internal maxillary artery 

 Transverse facial artery 

 STENSON'S DUCT, TURNED FORWARDS 



Superior oblique 



Splenius capitis, cut 



T/iinl part of occipital artery 

 I 



Superior constrictor 



AacfniUng palatine ar. 



Ascemlinfj pharyngeal 



arler\i 



External carotid 



artfirt/, cut short 



Stylo-pharyilgeus 



Digastrieus 

 f'oslerior auricular 

 First part of [ar. 



occipital artery 

 Princeps cervicis ar. 

 Occipital part of 

 vertebral artiry 

 Inferior oblique, 



cut 

 Complexus, cut 



SemispinaliB colli 



Complexus. cut 



Ascending cervical 

 artery 



Vertebral artery 



N— Deep cervical 

 >. artery 



Sterno-mastoid, cut 



SUBMAXILLARY GLAND 

 Superior thyroid artery 



Rectus capitis amicus major 



external carotid, l:)ut as it ascends in the neck the external carotid becomes more 

 superficial and in front of the internal. The internal carotid passes up the neck, 

 in front of the transverse processes of the upper cervical vertebrie lying upon 

 the rectus capitis anticus major to the carotid foramen, thence through the carotid 

 canal in the petrous portion of the temporal bone, making at fir.^t a turn forwards 

 and inwards and then a second turn upwards, and enters the cranium through 

 the foramen lacerum medium. It then makes a sigmoid curve on the side of the 

 bodv of the sjtlienoid bone, and terminates, after jierforating the dura mater, by 

 32 



