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Summary
Olfactory bulb images showing gemmulofugal polarity are artifacts from sectioning. Internal granule cells lack these synapses, suggesting neurotransmitters act on non-synaptic membranes.
Area of Science:
- Neuroscience
- Cell Biology
Background:
- The olfactory bulb's external plexiform layer (EPL) exhibits complex synaptic organization.
- Understanding synaptic polarity is crucial for interpreting neural circuit function.
Purpose of the Study:
- To re-evaluate the apparent gemmulofugal polarity observed in the olfactory bulb's EPL.
- To determine the true synaptic connections of internal granule cells.
Main Methods:
- Analysis of synaptic structures within the olfactory bulb EPL.
- Microscopic examination of sectioned neural tissue.
Main Results:
- Observed gemmulofugal polarity in EPL images is an artifact of sectioning planes.
- Gemmulopetal synapses with postsynaptic vesicles were misinterpreted.
- Internal granule cells do not possess true gemmulofugal synapses.
Conclusions:
- Apparent gemmulofugal synapses in the olfactory bulb EPL are sectioning artifacts.
- Neurotransmitters from internal granule cell vesicles likely act on non-synaptic membranes.