286 



LECTURE XII. 



side, namely, which is turned towards the vitreous body 

 (Fig. 85, f) ; posteriorly, there follows a stratum of vary- 

 ing thickness, which belongs to the retina indeed, but in 

 no wise proceeds from the direct expansion of the optic 

 nerve. In this layer we see, where it borders upon the 

 layer of pigment-cells of the choroid coat, and in imme- 

 diate contact with these cells, a peculiar stratum which 

 has been subjected to a strange destiny, inasmuch as it 

 was for a considerable time transplanted to the anterior 



FIG. 85. 



side of the retina the famous bacittar layer (layer of 

 rods Stabchenschicht [membrana Jacobi]) (Fig. 85, s). 

 This layer, which belongs to the most easily injured 

 parts of the eye, and for this reason in many instances 

 escaped the notice of earlier observers, consists, when 

 viewed in profile, of a very large quantity of closely 



Fig. 85. A. Vertical section through the whole thickness of the retina, after it 

 had been hardened in chromic acid. I. Membrana limitans, with the ascending, 

 supporting fibres. /. Fibrous layer of the optic nerve, g. Layer of ganglion-cells. 

 n. Grey, finely granular layer, with the radiating fibres passing through it. k. In- 

 ternal (anterior) granular layer. L Intermediate, or intergranular, layer, k'. Ex- 

 ternal (posterior) granular layer, s. Layer of rods and cones. 300 diameters. 

 jB, C (after H. Miiller). Isolated radiating fibres. 



