254 



HEAD AND NECK 



Arteria Ciliares. The ciliary arteries are very numerous. 

 Two groups are recognised viz., a posterior and an anterior. 

 Two sets of posterior ciliary arteries are described. They 

 are known as the short and the long posterior ciliary arteries 

 respectively. The short ciliary arteries are several in number ; 

 they spring partly from the ophthalmic trunk and partly from 

 its lacrimal and muscular branches. They accompany the 

 short ciliary nerves and, after piercing the posterior part of 



1 Medial palpebral 



Frontal v 



Dorsal nasal 



Infra-trochlear nerve 



, Anterior ethnioidal 

 \J artery and nerve 



Posterior ciliary 

 Posterior ethmoidal 

 Ophthalmic 



Lateral 

 palpebral 



Supra-orbital \ 



Arteria centralist 

 retina? 



Posterior ciliary 

 Muscular . 

 Lacrimal ; 



Ophthalmic 



Naso-ciliary nerve 

 ^Internal carotid 



FIG. 95. Diagram of the Ophthalmic Artery and its Branches. 

 (After Quain and Meyer, modified. ) 



the sclera, around the optic nerve, they enter the chorio- 

 apillary layer of the chorioid. The long posterior ciliary 

 arteries (Fig. 94) are two in number. They spring from the 

 ophthalmic trunk and run forwards, one on each side of the 

 optic nerve. After they have pierced the sclera they run 

 forward, one on each side, in the horizontal plane, anct 

 between the sclera and the chorioid to the iris. The anterior 

 ciliary arteries come off, in the anterior part of the orbit, 

 from the lacrimal and muscular branches. They vary in 

 number from six to eight, and run to the anterior part of 



