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Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
The Synapse02:47

The Synapse

Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...

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Related Experiment Video

Updated: Jun 12, 2026

Paired Whole Cell Recordings in Organotypic Hippocampal Slices
09:23

Paired Whole Cell Recordings in Organotypic Hippocampal Slices

Published on: September 28, 2014

Strong CA2 pyramidal neuron synapses define a powerful disynaptic cortico-hippocampal loop.

Vivien Chevaleyre1, Steven A Siegelbaum

  • 1Department of Neuroscience, Kavli Institute for Brain Science, Howard Hughes Medical Institute, Columbia University, New York, NY 10032, USA. vc2240@columbia.edu

Neuron
|June 1, 2010
PubMed
Summary

Hippocampal CA2 pyramidal neurons exhibit reversed synaptic strength, with distal inputs being stronger than proximal ones. This unique circuit organization is crucial for spatial memory formation.

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Last Updated: Jun 12, 2026

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Electrophysiological Investigations of Retinogeniculate and Corticogeniculate Synapse Function
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Electrophysiological and Morphological Characterization of Neuronal Microcircuits in Acute Brain Slices Using Paired Patch-Clamp Recordings
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Electrophysiological and Morphological Characterization of Neuronal Microcircuits in Acute Brain Slices Using Paired Patch-Clamp Recordings

Published on: January 10, 2015

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Synaptic Plasticity

Background:

  • Neurons integrate synaptic inputs to generate action potentials.
  • Synaptic input strength typically decreases with dendritic distance from the soma.
  • The function of hippocampal CA2 pyramidal neurons remains largely unknown.

Purpose of the Study:

  • To investigate the synaptic input integration properties of hippocampal CA2 pyramidal neurons.
  • To elucidate the role of CA2 neurons in hippocampal circuitry and function.
  • To understand the circuit mechanism underlying spatial memory.

Main Methods:

  • Electrophysiological recordings in hippocampal slices.
  • In vivo and in vitro stimulation of specific neuronal pathways.
  • Analysis of synaptic responses and neuronal excitability.

Main Results:

  • Hippocampal CA2 pyramidal neurons display a reversed synaptic strength rule.
  • Distal dendritic inputs from the entorhinal cortex strongly excite CA2 neurons.
  • Proximal dendritic inputs from CA3 neurons weakly activate CA2 neurons.
  • CA2 neurons form strong excitatory connections with CA1 neurons.

Conclusions:

  • CA2 neurons act as a critical link between cortical and hippocampal circuits.
  • This unique circuit architecture facilitates information flow from the entorhinal cortex to CA1 neurons.
  • The CA2-CA1 circuit likely plays a key role in hippocampal-dependent spatial memory processing.