THE ORBIT 



253 



wall of the orbit, below the superior oblique muscle. At the 

 medial margin of the front of the orbit it ends by dividing 

 into two terminal branches viz., the frontal and the dorsal 

 nasal (Fig. 95). 



The branches of the ophthalmic artery are very numerous, 

 but it is seldom that they can all be satisfactorily displayed, 

 unless a special injection has been made. They are : 



7. Palpebral. 



8. Dorsal nasal. 



9. Frontal. 



Arteria Lacrimalis. The lacrimal branch accompanies 

 the lacrimal nerve; it supplies the lacrimal gland and the 



1. Lacrimal. 



2. Muscular. 



3. Arteria centralis retinae. 



4. Ciliary. 



5. Supra-orbital. 



6. Ethmoidal. 



Sinus venosus sclerae 



Anterior ciliary 

 artery 



Sclera 



Vena vorticosa 



Long posterior 

 ciliary artery 



Anterior ciliary 

 artery 



Ciliary muscle 



Long posterior 

 ciliary artery 



Vena vorticosa 



Long posterior 

 ciliary artery 



FIG. 94. Dissection of the Eyeball showing the Arrangement 

 of the Ciliary Nerves and Vessels. 



conjunctiva. In each eyelid an arterial arch, the areas 

 tarseus, is formed by the anastomoses of the two lateral 

 palpebral branches of the lacrimal with the two medial 

 palpebral branches of the ophthalmic. 



Muscular branches come off at variable points, not only 

 from the main artery, but also from certain of its branches. 

 They supply the muscles contained in the orbital cavity. 



Arteria Centralis Retina. The arteria centralis retinae is 

 a minute but important artery. It pierces the infero-medial 

 surface of the optic nerve, 1 2 mm. (about half an inch) posterior 

 to the eyeball, and passes, in the substance of the nerve, 

 to the interior of the globe of the eye. 



