Related Experiment Videos
[Retinal ganglion cell topography during prenatal development].
K Tetsumoto1, T Sugiura, T Asai
1Department of Ophthalmology, School of Medicine, Kobe University, Japan.
Nippon Ganka Gakkai Zasshi
|October 1, 1990
Summary
Human retinal development shows early foveal structure establishment by 32 weeks. Ganglion cell density changes vary by retinal region, indicating distinct developmental processes like cell death and expansion.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Context:
- The human visual system exhibits a nonuniform distribution of retinal ganglion cells.
- Adult retinal topography features a foveal peak in ganglion cell density, declining peripherally.
- Fetal retinal development involves complex processes like nonuniform expansion and cell death to establish this topography.
Purpose:
- To investigate the developmental changes in human fetal retinal ganglion cell numbers and distribution.
- To analyze these changes in relation to horizontal eccentricity from the foveola at different gestational ages (32 and 40 weeks).
Summary:
- Analysis of toluidine blue stained human fetal retinas (32W and 40W) revealed that the fovea's fundamental structure is established by 32 weeks.
- The nasal retina showed higher density at 32W, decreasing significantly by 40W and adulthood, suggesting postnatal ganglion cell death.
- Mid-temporal retina density remained stable, indicating early topographical establishment, while peripheral temporal retina showed decreasing density, implying ongoing topographical changes.
Impact:
- Provides insights into the critical developmental stages and regional variations in human retinal topography formation.
- Highlights the interplay of nonuniform expansion and programmed cell death in shaping the retinotopic map.
- Contributes to understanding the basis of visual system development and potential origins of visual field defects.