Anatomy Of Retina Flashcards
Which is the most highly developed tissue in the eye?
Retina
What is the colour of retina ?
It is a transparent layer and appears purplish red due to the presence of visual purple of the rods and underlying choroid
What is the surface area of retina ?
266m^2
Extent of retina
From the optic disc posteriorly to the ora serrata anteriorly
Retina is thinnest and thickest at
Thinnest - ora serrata
Thickest - peripapillary area or around the optic disc
How many layers does the retina have ?
10
10 layers of retina is arranged how ?
Arranged into two functional components . They are the outer retinal pigment epithelium (RPE) and inner neurosensory retina (has the other 9 layers) with a potential space between these two components
The neurosensory retina consists of three different types of cells and their synapses
What does the retinal pigment epithelium consists of?
It has a single layer of hexagonal cells containing melanin pigment
Functions of RPE
Metabolic support to neurosensory retina
Anti reflective nature (protect the neurosensory retina from excess light due to the presence of melanin pigment )
What is Bruch’s membrane ?
Basal lamina of choroid to which RPE is firmly adherent
What does the layers of rods and cones have ?
They consist of the outer and inner segment of rods and cones
Cones - 6.5 million (for central and colour vision)
Rods - 120 million (for peripheral vision and night vision)
External limiting membrane ?
Present inside the layers of rods and cones ; fenestrated membrane thorough which the processes of rods and cones pass through
Outer nuclear layer consists of what ?
It consists of nucleus of rods and cones
Outer plexiform layers consists of what ?
Synapses between rods ,cones and bipolar cells
Inner nuclear layer has what ?
Has the nucleus / cell bodies of bipolar cells
Apart from bipolar cells , there are other cells such as a amacrine cells , muller cells , horizontal cells
