Local and afferent synaptic pathways in the striatal microcircuitry.

Area of Science:

• Neuroscience
• Cellular Biology
• Neuroanatomy

Background:

• The striatum, a key basal ganglia component, was previously thought to have a simple connectivity architecture.
• Existing models primarily included neocortical excitatory and midbrain dopaminergic inputs.
• Intrastriatal connections involved projection neurons and limited interneuron types.

Purpose of the Study:

• To summarize recent discoveries in striatal connectivity.
• To highlight the evolution of understanding striatal microcircuit architecture.
• To provide an overview of novel findings in basal ganglia research.

Main Methods:

• Review of recent experimental findings.
• Analysis of new methods for cell type and connectivity identification.
• Synthesis of emerging data on afferent pathways.

Main Results:

• The striatal microcircuit is now understood to be intricate, featuring newly defined, selectively interconnected neuron types.
• Novel afferent pathways to the striatum have been identified.
• Previously known inputs, such as midbrain dopaminergic projections, exhibit newly discovered properties.

Conclusions:

• Striatal connectivity is more complex than previously depicted.
• New experimental techniques have significantly advanced our understanding of the striatum.
• This review consolidates recent findings, offering a contemporary view of striatal circuitry.