BRANCHES OF THE UPPER CERVICAL GAXGLIOX 629 



branch of the first cervical ganglion is soft in texture and of a reddish 

 tint, seeming to be in some degree a prolongation of the ganglion itself. 

 In its course to the skull, it is concealed by the internal carotid artery, 

 with which it enters the carotid canal in the temporal bone, and it is 

 then divided into two parts, which are placed one on the outer, the 

 other on the inner side of the vessel. 



The external division distributes filaments to the internal carotid 

 artery, and, after communicating by means of other filaments with the 

 internal division of the cord, forms the carotid 2Jlexus. 



Fig. 3S2. 



Fig. 3S2. — Connections op the Sympathetic Nerve thkopgh its Carotid Branch 

 WITH some op the Cranial Nerves. 



The full description of this figure will be found at p. 539. The following numbers 

 refer to sjTnpathetic nerves and their connections : — 6, spheno- palatine ganclioa • 7 

 Vidian nei-ve ; 9, its carotid branch ; 10, a part of the sixth nerve, receiving twii^s from 

 the carotid plexus of the sj-mpathetic ; 11, superior cervical sympathetic ganglion ; 12 

 its prolongation in the carotid branch ; 15, anastomosing nerve of Jacobson • 16 twio- 

 uniting it to the sympathetic. 



The inner division, rather the smaller of the two, supplies filaments 

 to the carotid artery, and goes to form the cavernous plexus. The 

 terminal parts of these divisions of the cranial cord are prolono-ed on 

 the trunk of the internal carotid, and extend to the cerebral and 

 ophthalmic arteries, around which they form secondary plexuses, those 

 on the cerebral artery ascending to the pia mater. One minute plexus 

 enters the eye-ball with the central artery of the retina. 



It was stated by Ribes (Mem. de la Societe Med. d'Emulation, torn. viii. p. 606,) 

 that the cranial prolongations of the sympathetic nerve from the two sides 

 coalesce with one another on the anterior communicating artery, — a small gang- 

 lion or a plexus being formed at the point of junction ; but this connection has 

 not been satisfactorily made out by other observers. 



Carotid plexus. — The carotid plexus, situated on the outer side of 

 the internal carotid artery at its second bend (reckoning from below), 

 or between the second and third bends, joins the fifth and sixth cranial 

 nerves, and gives many filaments to the vessel on which it lies. 



Branch.es. — (a) The connection with the sixth nerve is established by means 

 of one or two filaments of considerable size, which are sui^plied to that nerve 

 where it lies by tlie side of the internal carotid artery. 



