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Synaptic Signaling

Synaptic Signaling

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.

The Synapse

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.

Synaptic Signaling

Synaptic Signaling

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...

Chemical Synapses

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 Synapses

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...

Integration of Synaptic Events

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...

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Related Experiment Video

Updated: May 7, 2026

Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals

Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals

Published on: May 25, 2011

Synaptic release at mammalian bipolar cell terminals.

Qun-Fang Wan¹, Ruth Heidelberger

¹Department of Neurobiology and Anatomy, University of Texas Medical School at Houston, Houston, Texas 77030, USA.

Visual Neuroscience

|January 29, 2011

Summary

Rod bipolar cells in the mammalian retina control visual information flow. This review details recent findings on how synaptic vesicle dynamics and neurotransmitter release shape retinal output.

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Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals

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Published on: October 1, 2014

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Last Updated: May 7, 2026

Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals

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Published on: May 25, 2011

Patch-clamp Capacitance Measurements and Ca2+ Imaging at Single Nerve Terminals in Retinal Slices

Patch-clamp Capacitance Measurements and Ca²⁺ Imaging at Single Nerve Terminals in Retinal Slices

Published on: January 19, 2012

Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals

Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals

Published on: October 1, 2014

Area of Science:

Neuroscience
Retinal Cell Biology
Synaptic Transmission

Background:

Bipolar cells are crucial for visual information processing in the vertebrate retina.
Their synaptic output is modulated by intrinsic and extrinsic factors, with limited knowledge on intrinsic regulation of neurotransmitter exocytosis.
Rod bipolar cells, particularly in mammals, are increasingly studied for presynaptic mechanisms.

Purpose of the Study:

To review recent advances in understanding synaptic vesicle dynamics.
To explore intrinsic factors regulating neurotransmitter release in rodent rod bipolar cells.
To discuss how these properties influence mammalian retinal synaptic output.

Main Methods:

Review of existing literature on rodent rod bipolar cells.
Analysis of studies on synaptic vesicle dynamics.
Examination of neurotransmitter release mechanisms.

Main Results:

Recent research has expanded knowledge on presynaptic mechanisms in mammalian rod bipolar cells.
Synaptic vesicle dynamics and neurotransmitter release properties are key to retinal function.
Understanding these intrinsic factors provides insight into visual processing.

Conclusions:

Significant progress has been made in characterizing rodent rod bipolar cell presynaptic function.
These findings are critical for understanding mammalian retinal synaptic output.
Further research into intrinsic factors will illuminate visual information transfer.