Carotis interna. 



A. 'pa.lpebr. i.wt 

 super, et infer. 



199 



AA. ciliar. j 

 long, et Itrev. 



M.trochlear. 



A. opJitJialm. 

 Carotis -int. 



543. Ramification of the Ophthalmic Artery in the 



rib it. Natural size. 



After the internal carotid has emerged from the cavernous sinus, 

 it gives off: 



1. The ophthalmic artery, Art. ophfhalmica, which passes through 

 the optic foramen into the orbit and divides below the trochlea into two 

 terminal branches, the nasal, Art. dorsalis nasi, and the frontal, Art. 

 frontalis. Its branches are : 



a) The small Arteria centralis retinae, which pierces the sheath and 

 substance of the optic nerve, and runs forwards within it to the retina; 



b) The lachrymal artery, Art. lacrymalis, which passes for- 

 wards along the upper border of the external rectus muscle to the lachry- 

 mal gland and gives off 1 or 2 posterior ciliary arteries, sends malar 

 branches into the Canalis zygomaticus facialis and temporalis, and divides at the 

 external angle of the eye into the Art. palpebralis externa superior et inferior; 



c) Muscular branches for the muscles of the eye-ball; 



d) 2 long and 3 or 4 short posterior ciliary arteries, 

 Arteriae ciliares posticae longae and breves, the former to the iris and ciliary 

 muscle, the latter to the choroid ; 



e) The s u p r a o r b i t a 1, Art. supraorbitalis, through the supraorbital 

 foramen to the forehead; 



f) The anterior and posterior ethmoidal, Art. etlimoidalis anterior 

 et posterior, the former to the cranium where it gives off a meningeal branch, 

 the Art. meningea anterior, and a nasal branch, which passes through the an- 

 terior foramen in the cribriform plate of the ethmoid to the nasal cavity; the 

 latter through the posterior ethmoidal foramen to the posterior ethmoidal cells. 



