Page 245 - Biology_F5
P. 245
Biology for Advanced Level Secondary Schools
tapetum which is found behind the retina. the vision of cats and nocturnals in dim
This protein layer reflects light back into light. The bright light shown by cats’ eyes
the eye and gives an opportunity for rod at night is the result of the reflection from
cells to absorb it. This character improves the tapetum.
Choroid epithelium
FOR ONLINE READING ONLY
Rod Layer of pigment
Vesicles
Cone Outer
segment
Infolding of cell
surface membrane
Constriction
Photoreceptor layer
Pair of cilia
Mitochondria
Inner
segment
Nucleus
End bulb
(equivalent of
synaptic knob)
Synaptic
region
Horizontal cell
Bipolar neurone
Intermediate layer
Amacrine cell
Ganglion cell
Internal
surface layer
Axon of optic
nerve
LIGHT RAYS
Figure 4.29: Structure of the retina
Form Five Student’s Book
238