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The development of basal forebrain projections to the rat visual cortex
A Dinopoulos1, L A Eadie, I Dori
1Laboratory of Anatomy, Veterinary School, University of Thessaloniki, Greece.
Experimental Brain Research
|January 1, 1989
Summary
This study reveals that basal forebrain projections to the rat visual cortex mature late, with significant development occurring around the second postnatal week. Cholinergic axons appear in the visual cortex during this critical developmental window.
Area of Science:
- Neuroscience
- Developmental Biology
- Neuroanatomy
Background:
- The basal forebrain is a critical source of cholinergic input to the cortex.
- Understanding the developmental timeline of these projections is essential for comprehending cortical maturation.
Purpose of the Study:
- To investigate the developmental trajectory of basal forebrain projections to the rat visual cortex.
- To identify key developmental milestones in the maturation of these cholinergic pathways.
Main Methods:
- Utilized retrograde tracer techniques, specifically wheat germ agglutinin-horseradish peroxidase (WGA-HRP).
- Injected tracers into the visual cortex of newborn rats to label projecting neurons in the basal forebrain.
Main Results:
- Retrogradely labeled neurons were identified throughout the basal forebrain in newborn rats.
- Neuron size and staining intensity were comparable to adults only by the end of the second postnatal week.
- This maturation coincided with increased choline acetyltransferase (ChAT) activity and the appearance of ChAT-labeled fibers in the visual cortex.
Conclusions:
- A significant developmental event occurs around the second postnatal week, marked by the emergence of cholinergic axons in the visual cortex.
- Cholinergic projections from the basal forebrain to the visual cortex develop later than other subcortical afferents.