Organ of Vision 



225 



naJis ScMenywti 

 (Plexus ven.ci.Uar.) 



303. Section at the Place where 

 continued into the Cornea. Magn. = 

 of Alex. I wan off. 



The choroidis supplied 

 with blood by three or four 

 short ciliary arteries, Arteriae 

 ciliares posticae breves, the iris 

 and the ciliary muscle 

 by the two long ciliary 

 arteries, Arteriae ciliares posti- 

 cae longae and the anterior 

 ciliary, Arteriae ciliares anticae, 

 whose number differs (all 

 are branches of the ophthal- 

 mic artery). The veins, Vasa 

 vorticosa, four or five in num- 

 ber, developed from the capil- 

 laries, pierce the sclerotic 

 about half way between the 

 cornea and place of entrance 

 of the optic nerve. The blood 

 also flows through the Venae 

 ciliares anticae et posticae. 



The iris, choroid and 

 ciliary muscle are supplied 

 by the ciliary nerves, which, 

 ten to sixteen in number, 

 pierce the sclerotic at its pos- 

 terior portion ; also by fibres 

 from the Nervus sympathicus. 

 Heitzmann, Atlas. I. 



the Sclerotic is 



100. After a Specimen 



NERVI CILIARES 

 fromt.GANSL. CILIAR. TRIO. 



304. 



The Nerves of the Iris 

 Chorioidea. 



Magn. = 2. 



and 



29 



