712 



THE EYE. 



close to the eye-ball, the funiculi are seen to enter by a group of pores ; and 

 to the part of the sclerotic thus perforated the name of lamina cribtosa is 

 sometimes given. Around this cribrous opening are smaller apertures for 

 vessels and nerves. 



Fig. 459. 



Fig. 459. VIEW OP THE LOWER HALF OP THE RIGHT ADULT HUMAN EYE, DIVIDED 



HORIZONTALLY THROUGH THE MIDDLE. 



The specimen from which this outline is taken was obtained by dividing the eye of a 

 man of about forty years of age in the frozen state. It was carefully compared with 

 other specimens obtained in a similar manner ; and in the drawing averages have been 

 given in any particulars in which differences among them presented themselves. 



1, the cornea ; 1', its conjunctival layer ; 2, the sclerotic ; 2', sheath of the optic 

 nerve passing into the sclerotic ; 3, external or vascular layer of the choroid ; 3', its 

 internal pigmental layer ; 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 side) ; 

 7', the smaller inner side ; 8, placed on the divided optic nerve, points to the arteria 

 centralis retinae ; 8', colliculus or eminence at the passage of the optic nerve into the 



