I520 



A MANUAL OF ANATOMY 



externa intervenes between the outer nuclear layer and the bacillary 

 layer. The layers of the retina are supported by fibres called the 

 sustentacular fibres. 



I. Stratum Opticum. — ^This layer consists of the fibres of the optic 

 nerve, and it extends from the optic disc to the ora serrata. The 

 fibres are non-medullated, and are chiefly centripetal, but some are 

 centrifugal. The centripetal fibres arise mainly as the axons of 



Pigmentary Layer 



Layer of Rods and Cones 

 i. Membrana Limitans Externa 



. Outer Nuclear Layer 



LOuter Molecular Layer 



i 



► Inner Nuclear Layer 



.Inner Molecular Layer 



.Layer of Nerve-cells 

 (.Ganglionic Layer) 



Layer of Nerve-fibres 

 Membrana Limitans Interna 



Fig. 634. — Diagrammatic Section of the Human Retina (Schultze). 

 (Copied from Quain's ' Anatomy'). 



the cells of the ganglionic layer. The centrifugal fibres pass 

 towards the inner molecular and inner nuclear layers. 



2. Ganglionic Layer. — ^This layer consists of large, somewhat 

 flask-shaped, multipolar ganglion-cells, which for the most part 

 form a single layer. In the macula lutea, however, they form several 

 layers. The round ends of the cells rest upon the stratum opticum, 

 and from each of these ends an axon is given off, which enters the 

 stratum opticum obliquely, and forms one of its component fibres. 

 The tapering end of each cell sends off several dendrites, which enter 



