732 



THE EYE. 



longed inwards from it, to form cells for the contained fluid, but obser- 

 vations with the microscope do not show any in the adult, though in the 

 foetus there are fibres in the interior of the vitreous mass, with "minute 



Fig. 482. 



Ic 



Fig. 482. VERTICAL SECTION OF A PART OP THE EYEBALL, SHOWING THE CONNECTIONS OP 

 THE CORNEA, SCLEROTIC, IRIS, CILIARY MUSCLE, HYALOID, AND LENS, f 



The full description of this figure will be found at p. 720 ; the following references 

 apply to the lens and parts connected with it. A, the anterior aqueous chamber in front 

 of the pupil ; ap, the recess forming the posterior division of the aqueous chamber, the 

 iris resting between this and the pupil on the surface of the lens ; ir, radiating fibres of 

 the iris or dilatator pupillse muscle ; to, orbicular fibres or sphincter muscle ; u, pigment 

 layer of the iris or uvea ; In, the lens at its centre ; Ic, its capsule ; Ice, granular or 

 cellular layer in front of the lens ; this layer is seen to terminate abruptly at the margin 

 of the lens, where the new fibres of the lens are developed, and from whence the nuclei 

 of the fibres extend for a certain depth inwards in an irregular plane in the growing 

 lens ; A, the hyaloid membrane ; Z, the zonule of Zinn ; P, the canal of Petit ; II, 

 in front of it the suspensory ligament of the lens ; h', the part of the hyaloid which 

 closes the canal of Petit behind and extends to the posterior surface of the lens ; V, the 

 vitreous humour. 



nuclear granules" at their point of junction. (Bowman.) It is still 

 doubtful how far the appearances of lamination produced by the action of 

 chromic acid, or of radiated fibrillation resulting from congelation, are true 

 indications of any actually existing structure in the interior of the vitreous 

 humour. 



The fluid collected from the vitreous body by puncturing it resembles 

 water : it contains, however, some salts with a little albumen. 



