ANATOMY IN A NUTSHELL. 



395 



al fissure external and below the frontal nerve and passes along the upper bor- 

 der of the External rectus muscle. It then pierces the palpebral fascia and 

 supplies the conjunctiva and integument at the outer canthus of the eye and 

 that over the external angular process. 



The nasal branch is the third division of the ophthalmic division of the 

 fifth. It passes into the orbit between the two divisions of the third nerve on 

 the floor of the sphenoidal fissure. In the orbit it passes from the outer to the 

 inner side over the optic nerve, below the Superior rectus, then it passes between 

 the Superior oblique and Internal rectus to leave the orbit through the anterior 

 ethmoidal foramen with the anterior ethmoidal vessels into the cranium. In 

 the cranium it passes forward outside of the dura mater, which separates it 

 from the Levator palpebral to pass through the nasal slit into the nasal fossa 

 where it divides into its three terminal branches. 



PLATE CCX. 



CILIARY PROCESSES. 

 AND MUSCLE^ 



SUSPENSORY LIGAMENT. 



Crystalline Lens. 



(a) Internal or septal branch, which is distributed to the upper and 

 front of nasal septum, (b) External branch to superior and middle turbinated 

 bones and to the mucous membrane of the outer wall of the nose, (c) Anterior 

 branch runs in the groove on the inner surface of the nasal bone. It pierces the 

 wall of the nose between the nasal bone and the upper lateral cartilage and sup- 

 plies the integument of the lower part of the dorsum of the nose as far as the tip. 



The nasal nerve gives off the following collateral branches: 



1. The long root to the ciliary ganglion which runs forward on the outer 

 side of the optic nerve to the upper and back part of the ciliary, lenticular, or 

 ophthalmic ganglion. 



2. Long ciliary branches, two or three in number, pass along the inner 

 side of the optic nerve, join the short ciliary branch from the ganglion, thru 

 pierce the sclerotic coat to be distributed to the ciliary muscle, the iris, and the 

 cornea. 



3. Infratrochlear nerve is given off just before the nasal nerve passes 

 between the Superior oblique and Internal rectus. It communicates with the 

 Supratrochlear and is distributed to the skin of the eyelid and side of the nose, 

 conjunctiva, lachrymal sac, and caruncula lachrynialis. 



This lenticular, ciliary, or ophthalmic ganglion has three roots. 



