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362 Veterinary Histology of Domestic Mammals and Birds

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16.22 High power view of pars optica retinae (fundus, cat). Azan stain (x1000).

16.23 Layers of the neurosensory retina (schematic).

During embryonic development, the light-sensitive recep-
· neuron 2:
− inner nuclear layer (stratum nucleare internum), tor layer comes to lie furthest from the incoming light
− inner plexiform layer (stratum plexiforme signal, while the nerve layer that conducts the resulting
internum), impulse faces the interior of the eye.
· neuron 3: The photosensory layer (stratum neuro-epitheliale,
− ganglion cell layer (stratum ganglionare nervi rod and cone layer) comprises the processes of cells (epi-
optici) and theliocyti neurosensorii) that have their perikarya in the
− nerve fibre layer (stratum neurofibrarum). outer nuclear layer. These processes constitute the photo-
receptors of the eye and are divided into inner and outer

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