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Updated: Apr 21, 2026
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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
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Nonsensory target-dependent organization of piriform cortex
Chien-Fu F Chen1, Dong-Jing Zou1, Clara G Altomare1
1Department of Biological Sciences, Columbia University, New York, NY 10027; and.
Summary
The piriform cortex (PCX) efferent projections to the orbitofrontal cortex (OFC) are topographically organized. This suggests parallel output circuits in the PCX for odor object formation and recognition.
Area of Science:
- Neuroscience
- Olfactory System Research
Background:
- The piriform cortex (PCX) is crucial for odor object formation, but its efferent projections are poorly understood.
- Existing research on PCX primarily focuses on afferent and association fiber systems, neglecting output pathways.
Purpose of the Study:
- To investigate the efferent projections of the mouse PCX to the orbitofrontal cortex (OFC).
- To determine the organization and potential role of PCX output neurons (OPNs) in olfactory processing.
Main Methods:
- Utilized double fluorescent retrograde tracing in mice.
- Identified and mapped OPNs projecting to the agranular insula (AI) and lateral orbitofrontal cortex (LO) subdivisions of the OFC.
Main Results:
- AI-OPNs and LO-OPNs exhibited distinct spatial topography within the PCX.
- Fewer than 10% of OPNs projected to both AI and LO, indicating largely separate output pathways.
Conclusions:
- The efferent projections of the PCX are likely topographically organized.
- OPNs may form parallel output circuits, contributing to distinct olfactory representations in higher brain centers for odor recognition.
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