MNEMONICS🔥|| LAYERS OF RETINA || tricks for anatomy
Layers of Retina
The 10 differentiating layers of the retina from closest to farthest to the vitreous body are –
Inner Limiting Membrane
The inner limiting membrane is a boundary between the retina and vitreous body, it is lined with astrocytes and Müller cells.
Nerve Fibre Layer
The nerve fibre layer or the stratum opticum, is a layer that is formed by the expansion of optic nerves. The axons of the ganglion cells bodies also lie in this layer.
Ganglion Cell Layer
The ganglion cell layers are composed of the retinal ganglion cells and some of the displaced amacrine cells. It is made up of flask shaped cells that send its axons to the stratum opticum.
Inner Plexiform Layer
The inner plexiform layer, also called the inner synaptic layer, consists of axons of the bipolar cells and the dendritic processes of the ganglion and amacrine cells. Sometimes, a few spongioblasts are also found embedded in the layer.
Inner Nuclear Layer
The inner nuclear layer is composed of the cell bodies of horizontal cells, amacrine cells and bipolar cells.
Outer Plexiform Layer
The outer plexiform layer or the outer synaptic layer is a layer consisting of a dense network of neuronal synapses between the dendrites of horizontal cells and the photoreceptor cells (rods and cones) that extend from the outer nuclear layer.
Outer Nuclear Layer
The outer nuclear layer consists of the cells bodies of the photoreceptor cells of the retina – rods and cones.
External Limiting Membrane
The external limiting membrane is a distinguishing layer of the retina that separates the inner segments of the photoreceptor cells from their nuclei.
The Layer of Rods and Cones
Retinal Pigment Epithelium
It is a layer of cuboidal epithelial cells that is attached to the choroid. Its function is to provide nourishment to the retinal visual cells. This layer consists of a black pigment that prevents reflection in the eyeball.