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Basal Forebrain Projections to the Retrosplenial and Cingulate Cortex in Rats.

Hideki Kondo1, Laszlo Zaborszky1

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The Journal of Comparative Neurology
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PubMed
Summary
This summary is machine-generated.

The basal forebrain projects to the anterior cingulate cortex (ACC) and retrosplenial cortex (RSC) via cholinergic and non-cholinergic pathways. These projections differ based on brain region and cell type, revealing complex connectivity patterns.

Keywords:
basal forebraincholinergic neuronscingulate cortexnon‐cholinergic neuronsprelimbic cortexretrosplenial cortex

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Area of Science:

  • Neuroscience
  • Neuroanatomy
  • Cellular Neuroscience

Background:

  • The basal forebrain (BF) modulates cortical activation via widespread projections.
  • Previous studies indicate specific BF projections to cortical regions.
  • Understanding these projections is key to deciphering cortical function.

Purpose of the Study:

  • To investigate the cholinergic and non-cholinergic projections from the BF to the rat retrosplenial cortex (RSC) and anterior cingulate cortex (ACC).
  • To map the specific BF subregions projecting to the RSC and ACC.
  • To differentiate the projection patterns based on neurotransmitter type and cortical location.

Main Methods:

  • Utilized retrograde tracers (Fast Blue and Fluoro-Gold) in rat models.
  • Combined tracer injections with choline acetyltransferase (ChAT) immunostaining.
  • Analyzed projection neuron origins in BF subregions like the medial globus pallidus (GP), vertical limb of the diagonal band (VDB), medial septum (MS), and horizontal limb of the diagonal band (HDB).

Main Results:

  • Both RSC and ACC receive cholinergic and non-cholinergic projections, primarily from the HDB and VDB.
  • ACC and prelimbic cortex (PL) receive projections from the rostral GP, while the RSC receives stronger non-cholinergic input from VDB and MS.
  • A reversal in GP and MS/VDB non-cholinergic projections occurs along the rostrocaudal axis from PL to RSC.
  • Cholinergic neurons constitute approximately 37% of ACC and 33% of RSC projection neurons.
  • A small population of projection neurons in MS/VDB and HDB project to both RSC and ACC.

Conclusions:

  • The ACC and RSC receive both overlapping and distinct projections from the BF.
  • Cholinergic and non-cholinergic projections vary significantly across different BF subregions and cortical targets.
  • Findings highlight the complex and differentiated organization of BF-cortical circuitry.