Timeline for Is the bipolar neuron of the retina considered a sensory neuron?
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Sep 25, 2017 at 12:51 | vote | accept | deechitpoudel | ||
| Aug 6, 2017 at 5:38 | vote | accept | deechitpoudel | ||
| Sep 25, 2017 at 12:50 | |||||
| Jun 9, 2017 at 12:15 | history | edited | Oliver Houston | CC BY-SA 3.0 |
added 911 characters in body
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| Jun 9, 2017 at 11:26 | history | bounty ended | deechitpoudel | ||
| Jun 9, 2017 at 6:25 | comment | added | Bryan Krause♦ | @DeechitPoudel I'm guessing the 20% number is referring to inhibitory interneurons; 20% is definitely a reasonable number for inhibitory interneurons in cortex (including hippocampus). If you want to define 80% of cells as "interneurons" that probably defines interneurons to include cells that project neurons within whole regions of the brain, like neurons that project to distant areas within neocortex. I'd say that is a relatively unusual way to define interneurons, but as we have addressed already, the terminology varies by source. | |
| Jun 9, 2017 at 2:48 | comment | added | deechitpoudel | @BryanKrause It seems I am getting the picture. Although there is one thing that is bugging me. I have included that in the edited question. | |
| Jun 8, 2017 at 18:34 | comment | added | Bryan Krause♦ | @OliverHouston I agree, most people don't consider inner hair cells to be neurons: in that case I would say that spiral ganglion neurons are the sensory neurons; photoreceptors are usually considered neurons, however. It's really a developmental distinction more than anything else. I also agree 100% with what you say about projection and interneurons in your comment - for OP, if you are asking these questions because you are studying a textbook, you will simply have to familiarize yourself with how your textbook chooses to label things. | |
| Jun 8, 2017 at 12:38 | vote | accept | deechitpoudel | ||
| Jun 8, 2017 at 12:38 | |||||
| Jun 8, 2017 at 8:20 | comment | added | Oliver Houston | @DeechitPoudel, It depends on the textbook and the level of understanding you are expected to know. But in reality, no projecting neurons are neurons that carry information from one region of the brain to the other, e.g. from the brainstem to the midbrain. (In the UK, at approx. age 16, students are taught that all neurons in the brain are interneurons, which is a massive oversimplification). | |
| Jun 8, 2017 at 8:08 | comment | added | Oliver Houston | Thanks Bryan, that sums up the difficulties in the field. When studying inner hair cells, we would never consider them to be neurons, which would make the spiral ganglion neurons the sensory neurons, or there are no "sensory neurons" for hearing. | |
| Jun 8, 2017 at 7:34 | comment | added | deechitpoudel | Are projecting neurons textbook interneurons? | |
| Jun 7, 2017 at 23:30 | comment | added | Bryan Krause♦ | I think the most generalizable definition of interneuron is what you wrote here: "Interneurons will remain within a region of the brain, often inhibiting activity in other cells within the region (or exciting). Projecting neurons will carry information to a different brain region" (though for "brain" you could substitute any component of the nervous system). By that definition bipolar, amacrine, and horizontal cells are all interneurons. Rods/cones and retinal ganglion cells are not: one is a sensory receptor cell, the other is a projection neuron. | |
| Jun 7, 2017 at 23:27 | comment | added | Bryan Krause♦ | I like the overall message of this answer and gave it a +1, but I'd note that some people take a very narrow view of what "sensory neuron" means and intend to refer to the primary sensory neurons, which in this case would be the photoreceptors themselves. In my opinion it isn't an important distinction at all, as long as someone understands the actual functions, but sometimes textbooks or instructors can be overly precise on terminology even in cases where there is not a clear standard in the field. | |
| Jun 7, 2017 at 22:51 | history | answered | Oliver Houston | CC BY-SA 3.0 |