Arrangement of retinal layers
रेटिनल परतों की व्यवस्था
The layers in the eyes form outer to inner surface are as follows.
It is the outermost layer made up of white fibres.
2. Choroid :-
Inner to sclerotic.
3. Retina :-
It has following layers
1.Pigment epithelium :- It is the outermost layers of retina. The cells contoin melanin pigments which makes the interior of the eye boll dark. It is present over basement membrane knows as bruch’s membrane.
2.Rod and cover layer :- contain outer and inner segments of rods and cones.
3. External limiting membrane:- separates the inner segment of rods and cones from their nuclei.
4.External Nuellor layer :- contains nuclei of rods and cones.
5.External Plexiform layers :- contains the synopsis between the fibre of rods and cones and the fibres of bipolar neurons.
6.Internal nuclear layer :- contains the nuclei of bipolar neurons. The bipolar neurons are connected with each other by the Hmacuine cells which provide integration.
7. Internal plexiform layer :- contains the synapses b/t the fibres of bipolar neurons and the ganglia .
8. Ganglionic layer :- contains the ganglia these ganglia are over connected together by the Horizontal cells.
9.Optic neuron layer :- contains the optic neurons connected to the ganglia. These optic neurons move out from the eyes through the blind spot.
10.Internal limiting membrane:- It is the innermost layer of retina internally lived by Hyaloid membrane which Bunoerds the vitreous humor.
Human eyes [Mammalian eyes] are considered to be the pnverted eyes one to inversion of retinal layers. Inversion of retinal layers occurs during the development of eyes.
Development of eyes :- from both the thalami the outgrowth know as optic Vescicles develop. The optic vercicles INVAGINATE to form double wolves optic cups witch develop into retina. During the formation of optic cup the ovter Wall in vaginitis to form nervous layers of retina.
The choroid Cicliany body and cornea are mesodermal as they develop from the MESENDLYME. The lens is ectodermal develops from the epithelium which is ectodermal. After the formation of cans the epithelium is considered as conjunctiva .