398 



Arteries of the Head. 



A. supraorbitalis 



A. meningea 

 aftterior 



A. frontalis . 



M. obliquus 

 superior 



A. ethmoidalls ^ 

 anterior 



A. ethmoidalis 

 posterior 



Aa. ciliares 

 posterlores 



Bamus y. 



muscularis / 



Nervus opticus 



A. ophthalmica 



Chiasma opticum 



A. lacrimalls 



A. carotis interna 



Processus clinoideus anterior 



b) 



443. Arteries of the right orbit, viewed from above. 



Magnification : 10:7. 

 (The bdiiy roof and the contents of the orbit have been partially rentoved.) 



2. A. ophthalmica (contimted): 



a) A. centralis retinae (central artery of the retina) (not illustrated) often arises in common 

 with c), perforates the medial inferior surface of the sheath of the optic nerve and 

 passes in the axis of the same to the retina. 

 A. lacrimalis (lachrymal artery) runs forward over the m. rectus lateralis at the lateral 

 wall of the orbit: it gives off several aa. ciliares posteriores, and small branches into 

 the foramen zygomaticoorbitale, perforates the lachrymal gland, supplies it and ends 

 at the lateral angle of the eye in aa. palpehrales laterales, one for each eyelid. 



c) Aa. ciliares posteriores breves et lonr/ae (short and long posterior ciliary arteries), 

 4 6, partly from neighboring branches, divide manifoldly, perforate the sclera in 

 the neighborhood of the n. opticus and are distributed in the timica vasculosa oculi. 



,d) Rami musculares ., partly from neighboring branches, several in number, among them 

 fretjuentlj' <ine large, lateral, superior and one medial, inferior to the eye muscles. 



e) Aa. ciliares anteriores (see Eye) arise usuallj' from th(^ anterior ends of the rami 



musculares, run forward in the tendons of the eye muscles and pass partly upon the 

 scl(M-a to the margin of the cornea (aa. episclcrales). ])artly to the conjunctiva 

 (aa. conjunctivales anteriores), partly perforating the sclera to the m. ciliaris. 



f) A. snpraorhitales (see also Figs. 436, 437 and 441) passes just l)elow the roof of the 

 orbit to the foramen supraorbitale and through this to the forehead. 



A.ethmoidalis posterior (see also Figs. 439 and 440) through the foramen ethraoidale post, 

 to the posterior ethmoidal cells and to the postei-ior superior part of the nasal cavity. 



g) 



