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Axon terminals (also called terminal boutons, synaptic boutons, end-feet, or presynaptic terminals) are distal terminations of the branches of an axon. An axon, also called a nerve fiber, is a long, slender projection of a nerve cell that conducts electrical impulses called action potentials away from the neuron's cell body to transmit those ...
Neurotransmission (Latin: transmissio "passage, crossing" from transmittere "send, let through") is the process by which signaling molecules called neurotransmitters are released by the axon terminal of a neuron (the presynaptic neuron), and bind to and react with the receptors on the dendrites of another neuron (the postsynaptic neuron) a ...
One model of the tripartite synapse shows the presynaptic and postsynaptic terminals lying adjacent to each other, which the astrocyte is wrapped around the postsynaptic terminal. [1] However, localization and spatial distribution of the three elements of the tripartite synapse vary in different regions of the brain.
As it pertains to LTP, retrograde signaling is a hypothesis describing how events underlying LTP may begin in the postsynaptic neuron but be propagated to the presynaptic neuron, even though normal communication across a chemical synapse occurs in a presynaptic to postsynaptic direction. It is used most commonly by those who argue that ...
When an action potential fires at the dendritic spine where the action potential is initiated from the presynaptic terminal to the post synaptic terminal. This action potential is then carried down the length of the dendrite and then is propagated down the length of the axon in order to get the presynaptic terminal to then perpetuate the ...
The repeated additions to the axon terminal membrane would eventually result in the uncontrolled growth of the axon terminal, which could lead to disastrous breakdown of the synaptic complex. The axon terminal compensates for this problem by reuptaking the vesicle by endocytosis and reusing its components to form new synaptic vesicles. [1]
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 initiate or inhibit action potentials.
The presynaptic axon terminal, or synaptic bouton, is a specialized area within the axon of the presynaptic cell that contains neurotransmitters enclosed in small membrane-bound spheres called synaptic vesicles (as well as a number of other supporting structures and organelles, such as mitochondria and endoplasmic reticulum).