OPHTHALMIC. 



387 



a person receives a thrust from the end of a parasol, or falls down with a tobacco-pipe in his 

 mouth. In such cases a ligature should be applied to the common carotid. Its relation with 

 the tonsil should be especially remembered, as instances have occurred in which the artery has 

 been wounded, during the operation of scarifying the tonsil, and fatal hemorrhage has super- 

 vened. 



The branches given off from the internal carotid are : 



From the Petrous Portion 

 From the Cavernous Portion 



From the Cerebral Portion 



Tympanic. 



Arteria receptaculi. 

 < Anterior meningeal. 

 ( Ophthalmic, 

 f Anterior cerebral. 



Middle cerebral. 

 I Posterior communicating. 

 [Anterior choroid. 

 The cervical portion of the internal carotid gives off no branches. 

 The tympanic is a small branch which enters the cavity of the tympanum, 

 through a minute foramen in the carotid canal, and anastomoses with the tympanic 

 branch of the internal maxillary, and stylo-mastoid arteries. 



The arterise receptaculi are numerous small vessels, derived from the internal 

 carotid in the cavernous sinus ; they supply the pituitary body, the Casserian gan- 

 glion, and the walls of the cavernous and inferior petrosal sinuses. One of these 

 branches, distributed to the dura mater, is called the anterior meningeal; it anas- 

 tomoses with the middle meningeal. 



The OPHTHALMIC ARTERY arises from the internal carotid, just as that vessel 

 is emerging from the cavernous sinus, on the inner side of the anterior clinoid 



Fig. 213. The Ophthalmic Artery and its Branches, the Roof of the Orbit having been 



removed. 



liiKalmie 



temal Carat iS 



process, and enters the orbit through the optic foramen, below, and on the outer 

 side of, the optic nerve. It then crosses above, and to the inner side of, this 

 nerve, to the inner wall of the orbit, and passing horizontally forwards, beneath 



