ARTERIES 71 



thyroid cartilage to Sylvian fissure of brain, there dividing 

 into anterior and middle cerebral. 



Course. Extends directly upwards from common carotid 

 to carotid canal of temporal bone ; entering canal passes 

 upwards, internal to and then above Eustachian tube, then 

 forwards and inwards, then alongside of sella Turcica in the 

 cavernous sinus, having the 6th nerve on the outer side ; it 

 turns upwards on inner side of anterior clinoid process, 

 pierces dura mater, and divides between and and 3rd cranial 

 nerves at anterior perforated spot into branches. No branches 

 given off from cervical part. 



RELATIONS IN THE NECK. 



Superficial. Inner Side. Behind. 



Skin. Pharynx. Internal jugular veil . 



Superficial fascia. Ascending pharyngeal Rectus capitis anticus 



Platysma. artery. major. 



Deep fascia. Superior and external Sympathetic. 



Sterno-mastoid. laryngeal nerves. Pneumogastric. 



Parotid gland. 

 External carotid. 

 Digastric. 

 Stylo-hyoid. 

 Stylo-glossus. 

 Stylo-pharyngeus. 

 Occipital ) .,,**- 



Posterior auricular J ar1 

 Hypoglossal \ 



Glosso-pharyngeal l_-___ 

 Pharyngeal branch f ne 

 of vagus J 



Outer Side. 

 Internal jugular vein. 



Branch from Petrous portion : 



Tympanic : inconstant : through a foramen in carotid canal 

 to tympanum ; anas, tympanic of internal maxillary and stylo- 

 mastoid. 



Branches from Cavernous portion : 



Pituitary : small branches to pituitary body, etc. 



Meningeal : to dura mater in middle fossa. 



Ophthalmic : arises at inner side of anterior clinoid process, 

 enters orbit through optic foramen, external and below optic 

 nerve ; it then crosses over nerve to inner angle of orbit to 

 divide into two terminal branches, frontal and nasal. 



Branches arising outside Optic Nerve : 



Lachrymal : accompanies lachrymal nerve over external 

 rectus to lachrymal gland, gives off malar branches ; anas. 



