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Updated: Aug 6, 2026
11:24
Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
Published on: December 12, 2012
Specialized layer 5 cortical terminals target functional thalamic spines
Biorxiv : the Preprint Server for Biology
|July 17, 2026
Summary
Frontal cortex layer 5 (L5) neurons communicate with thalamic spines, influencing thalamic activity and motor learning. This study reveals a novel top-down pathway involving axo-spinous contacts.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Cortical Circuits
Background:
- Dendritic spines are key to synaptic transmission and plasticity.
- The existence of axo-spinous communication in the thalamus remains unknown.
Purpose of the Study:
- To investigate the presence and function of axo-spinous communication between the frontal cortex and thalamus.
- To characterize the properties of these newly identified synaptic contacts.
Main Methods:
- Electrophysiology to record synaptic responses.
- Optogenetics to manipulate frontal L5-thalamus pathway activity.
- Calcium imaging to assess synaptic responses.
Main Results:
- Layer 5 (L5) corticothalamic terminals selectively target thalamic spines.
- These axo-spinous synapses are enriched in AMPA receptors and their size correlates with spine head volume.
- Activation of the L5-thalamus pathway impacts thalamic spiking and motor learning, recruiting specific thalamic cell subnetworks.
Conclusions:
- A previously unrecognized, effective top-down communication channel exists between the frontal cortex and thalamus.
- This pathway utilizes variable axo-spinous contacts and influences thalamic activity and behavior.
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