THE HEAD AND NECK 



tt57 



short ciliary nerves pass forwards from it. The roots are called 

 long, short, and middle. The long or sensory root is derived from 

 the nasal nerve as it passes between the two heads of the external 

 rectus. It is slender, about | inch long, and enters the postero- 

 superior angle of the ganglion. The short or motor root is derived 

 from the long branch of the lower division of the third nerve which 

 supplies the inferior oblique muscle, and it enters the postero- 

 inferior angle of the ganglion. The middle or sympathetic root 



16 15 14 >3 



Fig. 471. — A, The Ciliary Ganglion ; B, The Nerves of the Orbit 

 (External View) (Hirschfeld and Leveille). 



1. Cavernous Plexus 



2. Ophthalmic Nerve 



3. Nasal Nerve 



4. Sympathetic Root of Ciliary 



Ganglion 



1. Gasserian Ganglion 



2. Third Nerve 



3. Sixth Nerve 



4. Internal Carotid Artery 



5. Optic Nerve 



6. Fibjous King for Recti 



5. Sensory Root of Ciliary 



Ganglion 



6. Long Ciliary Nerves 



7. Branch of Third Nerve to 



Inferior Oblique 



B 



7. Levator Palpebrae Superioris 



8. Superior Rectus 

 g. Frontal Nerve 



10. External Rectus 



11. Inferior Oblique 



12. Inferior Rectus 



13. Short Ciliary Nerves 



8. Motor Root of Ciliary Gang- 



lion 



9. Ciliary Ganglion 



10. Infratrochlear Branch of 



Nasal Nerve 



11. Short Ciliary Nerves 



14. Branch of Third Nerve to 



Inferior Oblique 



15. Ciliary Ganglion 



16. Ophthalmic Nerve 



17. Superior Maxillary Nerve 



18. Inferior Maxillary Nerve 



is a very minute nerve which is derived from the cavernous plexus 

 of the sympathetic, and it usually reaches the ganglion in company 

 with the long root. It may, however, join the ganglion separately, 

 and then it does so in close proximity to the entrance of the long 

 root. 



The branches of the ciliary ganglion are called the short ciliary 

 nerves. They are from six to eight in number, and come off, in two 

 groups, from the antero-superior and antero-inferior angles. The 



