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Related Concept Videos

Overview of Synapses01:25

Overview of Synapses

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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
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Electrical Synapses01:28

Electrical Synapses

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
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The Synapse02:47

The Synapse

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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.
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Chemical Synapses01:26

Chemical Synapses

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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...
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Chemical Synapses01:26

Chemical Synapses

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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...
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Synaptic Signaling01:09

Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
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Updated: Mar 9, 2026

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Measuring the Basic Physiological Properties of Synapses.

Matthew A Xu-Friedman1

  • 1Department of Biological Sciences, University at Buffalo, State University of New York, Buffalo, New York 14260.

Cold Spring Harbor Protocols
|January 5, 2017
PubMed
Summary
This summary is machine-generated.

Synaptic physiology research is vital for understanding brain function. Key factors like vesicle number (N), release probability (P), and quantal size (Q) are crucial for neurotransmitter release and synaptic refinement.

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Area of Science:

  • Neuroscience
  • Synaptic Physiology

Background:

  • Synaptic physiology is critical for understanding neurotransmitter release, synaptic development, and overall brain function.
  • The foundational framework for synaptic physiology, established by Katz and colleagues, centers on three key factors: N, P, and Q.

Purpose of the Study:

  • To discuss key experiments investigating the number of releasable vesicles (N), the probability of release (P), and quantal size (Q).
  • To explain how these fundamental quantities in synaptic physiology are assessed.

Main Methods:

  • Experimental approaches to quantify N, P, and Q.
  • Analysis of synaptic transmission parameters.

Main Results:

  • Experimental data illustrating the assessment of N, P, and Q.
  • Insights into the variability and regulation of these synaptic parameters.

Conclusions:

  • Understanding N, P, and Q is essential for dissecting synaptic function.
  • Key experiments provide critical insights into the mechanisms governing neurotransmitter release and synaptic plasticity.