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Updated: Mar 20, 2026
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Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo
Published on: September 22, 2017
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Absence of local retinotopy in the mouse optic tract
Matteo Tripodi1, Hiroki Asari1
1Epigenetics and Neurobiology Unit, European Molecular Biology Laboratory (EMBL), Monterotondo, Italy.
Frontiers in Neural Circuits
|March 19, 2026
Summary
The mouse optic tract (OT) shows only coarse retinotopy, not the fine-scale organization seen in other visual system areas. This suggests long-range axons in the optic tract lack precise spatial mapping.
Area of Science:
- Neuroscience
- Visual System Organization
- Retinotopy
Background:
- Retinotopy, the mapping of visual space onto neural tissue, is crucial for visual processing.
- This organization is established through precise wiring from the retina to subsequent visual centers like the LGN and visual cortex.
Purpose of the Study:
- To investigate the precision of retinotopic organization within the long-range projection axons of the optic tract (OT).
- To determine if fine-scale retinotopy is maintained at the axonal level in the OT.
Main Methods:
- Recording from retinal ganglion cell (RGC) axons in the mouse optic tract (OT).
- Mapping the receptive fields (RFs) of these RGC axons.
- Utilizing modeling analyses to assess the degree of retinotopic organization.
Main Results:
- Unlike the LGN, no correlation between spatial proximity of RGC axons and RF distance was found in the OT.
- RF distances in the OT were inconsistent with a locally retinotopic arrangement.
- The mouse OT exhibits coarse topography with significant deviations from ideal retinotopy (~18° RF deviations).
Conclusions:
- The mouse optic tract (OT) lacks fine-scale retinotopy.
- The OT maintains only a broad topographic structure for visual information transmission.
