Excitatory postsynaptic potential (EPSP)

Definition

An excitatory postsynaptic potential (EPSP) is a temporary increase in postsynaptic membrane potential due to the flow of positively charged ions into the postsynaptic cell. This change makes the neuron more likely to fire an action potential.

Related terms

Action Potential:

A rapid rise and subsequent fall in membrane potential across a neuronal membrane, used for communication over long distances within the neuron.

Synapse:

The junction between two neurons or between a neuron and a muscle cell, where electrical or chemical signals are transmitted from one cell to another.

Inhibitory Postsynaptic Potential (IPSP): A temporary hyperpolarization of postsynaptic membrane potential caused by the flow of negatively charged ions into the postsynaptic cell, making it less likely to fire an action potential