Easy
sensitive layer of the eye. In vertebrates, looking from external,
there are four
major cell layers: (i)
the outer neural retina, which contains
neurons (ganglion cells,
amacrine cells,
bipolar cells) as
well as
blood vessels, (ii) the
photoreceptor layer, a
single layer of rods and cones, (iii) the
pigmented retinal epithelium (PRE or RPE), (iv) the choroid, composed of
connective tissue,
fibroblasts and including a
well vascularised layer, the chorio capillaris, underlying the
basal lamina of the PRE. Behind the
choroid is the sclera, a
fat organ capsule.
In molluscs (especially cephalopods such as the squid) the
retina has the
easy sensitive cells as
the outer layer with the
neural and supporting
tissues below.
See:
retinal rods,
retinal cones, rhodopsin.
This
entry appears with alow from the Vocabulary of Cell and Molecular Biology