postsynaptic potential


postsynaptic potential
In a synapse, a change in the resting potential of a postsynaptic cell following stimulation of the presynaptic cell. For example, in a cholinergic synapse, the release of acetylcholine from the presynaptic cell causes channels to open in the postsynaptic cell. Each channel opening causes a small depolarization, known as a miniature end plate potential (mepp) ; these sum to produce an excitatory postsynaptic potential.

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • Postsynaptic potential — Postsynaptic potentials are changes in the membrane potential of the postsynaptic terminal of a chemical synapse. Postsynaptic potentials are graded potentials, and should not be confused with action potentials although their function is to… …   Wikipedia

  • postsynaptic potential — ▪ biology       a temporary change in the electric polarization of the membrane of a nerve cell ( neuron). The result of chemical transmission of a nerve impulse at the synapse (neuronal junction), the postsynaptic potential can lead to the… …   Universalium

  • postsynaptic potential — a change in polarization of a postsynaptic neuron; see excitatory postsynaptic p. and inhibitory postsynaptic p …   Medical dictionary

  • Excitatory postsynaptic potential — In neuroscience, an excitatory postsynaptic potential (EPSP) is a temporary depolarization of postsynaptic membrane potential caused by the flow of positively charged ions into the postsynaptic cell. They are the opposite of inhibitory… …   Wikipedia

  • Inhibitory postsynaptic potential — An Inhibitory Postsynaptic Potential (commonly abbreviated as IPSP) is the change in membrane voltage of a postsynaptic neuron which results from synaptic activation of inhibitory neurotransmitter receptors. The most common inhibitory… …   Wikipedia

  • inhibitory postsynaptic potential — n increased negativity of the membrane potential of a neuron on the postsynaptic side of a nerve synapse that is caused by a neurotransmitter (as gamma aminobutyric acid) which renders the membrane selectively permeable to potassium and chloride… …   Medical dictionary

  • excitatory postsynaptic potential — (EPSP) a transient decrease in membrane polarization induced in a postsynaptic neuron when subjected to a volley of impulses over an excitatory afferent pathway; summation of such potentials may cause discharge by the neuron …   Medical dictionary

  • potential — 1. Capable of doing or being, although not yet doing or being; possible, but not actual. 2. A state of tension in an electric source enabling it to do work under suitable conditions; in relation to electricity, p. is analogous to the temperature… …   Medical dictionary

  • End-plate potential — Miniature end plate potentials and end plate spikes recorded from muscle fiber End plate potentials (EPPs) (sometimes called end plate spikes ) are the depolarizations of skeletal muscle fibers caused by neurotransmitters binding to the… …   Wikipedia

  • Action potential — In physiology, an action potential is a short lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory. Action potentials occur in several types of animal cells, called… …   Wikipedia


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