Any neuron that participates in sending impulses from receptors to CNS are referred as sensory neurons. But I often see bipolar neurons of eye(which according to the above definition should be sensory neurons) being called interneurons. Same is the case with the amacrine cells and the horizontal cells.
So what are sensory neurons? Are all the following retinal neurons sensory?
- bipolar neurons,
- amacrine cells,
- horizontal cells &
- neurons of the optic nerve (ganglionic neurons)
And, as soon as the neurons of optic nerve terminate in optic lobe, then are all the neurons in the optic lobe connected to the neurons of optic nerve called interneurons?
Are all the neurons of brain interneurons? Obviously, there are neurosecretory cells in the hypothalamus that I wouldn't consider interneurons.
Still, wikipedia tells us that only 20% of neurons in the cortex are interneurons.
Unlike the peripheral nervous system (PNS), the central nervous system, including the brain, contains many interneurons. In the neocortex (making up about 80% of the human brain), approximately 20-30% of neurons are interneurons.
Shouldn't that be about 80%?