Cerebellar granule cell: ascending axon and parallel fiber
Bibliographic record
Abstract
Morphometric data have indicated that most (> 95%) of the granule cell axonal synapses are located along the parallel fibers. The ascending axons of granule cells, however, exert powerful excitatory effects on the activities of Purkinje cells. To resolve this apparent conflict, we propose that some of the parallel fiber synapses overlying a functionally homogeneous granule cell patch can discharge in close synchrony with the ascending axon synapses from that same granule cell patch, thereby augmenting the excitatory action from ascending axons. Moreover, we also propose that age may be an important factor in the ascending axon synapses. We examined the synaptic varicosities along the ascending axons and parallel fibers in the anterior lobe of the male NIA C57BL/6j mouse. Between 2.5 and 10 months, the fraction of synaptic varicosities anatomically associated with the ascending axons increased from 2.6% to 6.6% whereas the fraction of synaptic varicosities that can discharge in synchrony with ascending axon synapses (including some parallel fiber synapses) increased from 17.3% to 39% (assuming a granule cell patch of 300 x 300 microm). The results of the present study may be relevant to understanding the role of the ascending axon vs. the parallel fibers. Differential age-related synaptic changes in these two portions of the granule cell axons may constitute an important age-dependent synaptic remodeling in the granule cell-Purkinje cell synaptic system.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".