KYK AM VISION 



. II 



1. Mtmbnina ttmitans t'ntorncu This so-called membrane \\\ , 

 tact \\ilh tho vitroons humour is formed by (he junction laterally of 



tho bases of the mtaUocu/ar or m>- 



:v;'.v '<;':> ,;/' .!/. .'.V". \\liu h hoar tho 

 same relation to the retina as tho 

 Homo; Jia does to the brain. The 

 character ol these lihros may ho seen 



in tig. 572, 



:' < '. ., vs This layer is 



of \er\ \aryin- thirkness in iliiVoronl 

 parts of ilu> iviin.t 11 consists of 

 Muvlullatol tihn\s \\htrh intorla. 

 lUOSt of which aro the n\ons 

 iMge nor\i> rolls h-ninn;-; tlio 



layer. The fibres are supported 



siistontarnlar tihros. Thoy aro lo 

 loss numorons ant.Miorly. ami ond 

 l ho ,--... r.ita. Tho\ all ronvor^o 



toNVJirds tho cplio disc, \\horo thoy 

 h\i\o tho retina as tho optic HIM vo, 

 8. Layer of ganglion cells. T Ins ion 



MMs of lar ; ;o imilhpolui norvo rolls \\ith 

 l.u;;o and round nuoloi. fo-nninsr oillior 

 a single layor, or in soino parts of tho 

 nMina. ispooially noar tho niti<-ulti Iiitcn. 

 \\horo tin ilnok. it oon 



. . o! .-\ oral strata of nono oolls. 



rih-\ aro arranged \vith thoir sin^lo axis-eylindci pr>u ossos m\\ards. 



Thoso pass into and aro continuous \MI h ihe layor of optic norvo 



no\t 



t ho 



and 



at 



tho o\tornl 



, uuolous of U tibrv; 

 >>f tho libiv. 



;.Jn,-K, 



tihros. Internally (lie colls send oil* 

 which pass into the next layer. 



4. Inner molecular layer, This presents a tinoly granulated 

 appearance. It consists of nouroglia traversed by numerous fibrillar 



processes of the nor\ o cells |us| described, ami the minute hraneh- 

 -ses of the bipolar colls of the next layor. 



5. Innernuelear layer. This consists chuily of numerous small 



round colls, oach \\ ilh .1 \ cry small quantity of protoplasm surround 



ing a large ovoid nucleus; they are generally bipolar. i\ ing off one 



. outwards and another inwards. One process passes m\\ards 



to form a synapse with the arborisation of a gang-lion cell, the other 

 outwards to similarly arborise \\ith the branchings of the rod and 

 eono fibres. Some cells, called MV; : /.C/ .'.is.'s. or ,i in.n r;/,v colls. ho\\ 

 over, only send oil' ono proi-oss, which passes in\\ards (Jig. oV'.'V 

 Tho large o\al nuclei (Jig. ,">V-) behng'ing to the Mullerian tibres 

 occur in this layer. 



