Related Experiment Video
Updated: Aug 3, 2026
14:27
Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
Published on: August 11, 2019
The hippocampal lamella hypothesis revisited
P Andersen1, A F Soleng, M Raastad
1Department of Neurophysiology, Institute for Basic Medical Sciences, University of Oslo, Pb. 1104 Blindern, 0317, Oslo, Norway. andersen@basalmed.uio.no
Brain Research
|December 20, 2000
Summary
The lamellar organization of the CA3-to-CA1 connection in the hippocampus is a useful concept. New electrophysiological methods confirm Schaffer collateral density supports this understanding of hippocampal connectivity.
Area of Science:
- Neuroscience
- Neuroanatomy
Background:
- The CA3-to-CA1 connection is crucial for hippocampal function.
- Understanding the spatial organization of Schaffer collaterals is key to deciphering hippocampal circuitry.
Purpose of the Study:
- To re-examine the lamellar organization of the CA3-to-CA1 hippocampal connection.
- To assess the utility of the lamellar concept using novel electrophysiological techniques.
Main Methods:
- Utilized a sheet-like hippocampal preparation for whole CA1 region analysis.
- Employed electrophysiological quantification of Schaffer collateral density.
- Mapped Schaffer collateral distribution via CA3 stimulation and CA1 recording, and antidromic CA1-to-CA3 neuronal excitation.
Main Results:
- Schaffer collaterals originate from CA3 neurons and fan out across the septo-temporal extent of CA1.
- Compound action potential amplitude was maximal in a transverse band within CA1, oriented towards the subiculum.
- Electrophysiological data support the concept of lamellar organization.
Conclusions:
- The lamellar organization remains a valid and useful framework for understanding hippocampal CA3-to-CA1 connectivity.
- Novel electrophysiological quantification refines our understanding of Schaffer collateral distribution and density.
