DISSECTION OF THE EYEBALL. 



265 



sclerotic by being colourless and transparent. The choroid coat will be 

 recognised as the black layer lying subjacent to the sclerotic. It does 



Fig. 36. 

 View of the Lower Half of the Right Adult Human Eye, divided horizontally 



THROUGH THE MIDDLE. MAGNIFIED FOUR TIMES (A. Thomson). 



1. The cornea; 1'. Its conjunctival layer; 2. The sclerotic ; 2'. Sheath of the optic nerve passing 

 into the sclerotic ; 3. 3'. The choroid ; 4. Ciliary muscle, its radiating portion ; 4'. Cut fibres of the 

 circular portion ; 5. Ciliary fold or process ; 6. Placed in the posterior division of the aqueous 

 chamber, in front of the suspensory ligament of the lens ; 7. The iris (outer or temporal side) ; 7'. The 

 smaller, inner, or nasal side ; 8. Placed on the divided optic nerve, points to the arteria centralis 

 retinae ; S'. Papilla optica at the passage of the optic nerve into the retina ; S". Fovea centralis 

 retinae ; r. The nervous layer of the retina ; r. The bacillary layer ; 9. Ora serrata, at the com- 

 mencement of the ciliary part of the retina; 10. Canal of Petit; 11. Anterior division of the 

 aqueous chamber, in front of the pupil ; 12. The crystalline lens, within its capsule ; 13. The vitreous 

 humour ; a. a. a. Parts of a line in the axis of the eye ; b. b. b. 6. A line in the transverse diameter. 



not line the cornea, but terminates behind the line of junction of that 

 coat with the sclerotic, by a thickened edge — the ciliary process. At 



