434 CILIARY GANGLION. 



ganglion situated within the orbit, between the optic nerve and the exter- 

 nal rectus muscle ; it is in close contact with the optic nerve, and is sur- 

 rounded by adipose tissue, which renders its dissection somewhat difficult. 

 Its branches of distribution are the ciliary , w r hich arise from its anterior 

 angles by two groups : the upper group, consisting of about four filaments ; 

 and the lower, of five or six. They accompany the ciliary arteries in a 



Fig. 196* 



waving course, and divide into a number of filaments which pierce the 

 sclerotic around the optic nerve, and supply the tunics of the eyeball. A 

 small filament is said by Tiedemann, to accompany the arteria centralis 

 retinae into the centre of the globe of the eye. 



Its branches of communication are three, one, the long root, which pro- 

 ceeds from the posterior superior angle to the nasal branch of the ophthal- 

 mic nerve ; a short thick branch, the short root, from the posterior inferior 

 angle to the inferior division of the third nerve ; and a slender filament, 

 the sympathetic root, which passes backwards to the cavernous sinus, and 

 communicates with the carotid plexus. Occasionally the ciliary ganglion 



* The cranial ganglia of the sympathetic nerve. 1. The ganglion of Ribes. 2. The 

 filament by which it communicates with the carotid plexus (3). 4. The ciliary or len- 

 ticular ganglion, giving off ciliary branches for the supply of the globe of the eye. 5. 

 Part of the inferior division of the third nerve, receiving a short thick branch (the short 

 root) from the ganglion. 6. Part of the nasal nerve, receiving a longer branch (the long 

 Boot) from the ganglion. 7. A slender filament (the sympathetic root) sent directly 

 backwards from the ganglion to the carotid plexus. 8. Part of the sixth nerve in the 

 cavernous sinus, receiving two branches from the carotid plexus. 9. Meckel's ganglion 

 (spheno-palatine). 10. Its ascending branches, communicating with the superior maxil- 

 lary nerve. 11. Its descending or palatine branches. 12 Its internal branches, sphono- 

 palatine or nasal. 13. The naso-palatine branch, one of the nasal branches. * The 

 naso-palatine ganglion. 14. The posterior branch of the ganglion, the Vidian nerve. 

 Jf\ Its carotid branch (n. petrosus profundus) communicating with the carotid plexus. 

 JP-. Its petrosa! branch (n. petrosus superficialis minor), joining the intumescentia gangh- 

 <brmis of the facial nerve. 17. The facial nerve. 18. The chorda tympani nerve, which 

 descends to join the gustatory nerve. 19. The gustatory nerve. 20. The submaxillary 

 ganglion, receiving the chorda tympani, and other filaments from the gustatory. 21. 

 The superior cervical ganglion of the sympathetic. 



