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Medical Term:

presynaptic membrane


that part of the plasma membrane of an axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction; many synaptic junctions exhibit structural presynaptic characteristics, such as conic electron-dense internal protrusions, which distinguish it from the remainder of the axon's plasma membrane.

See Also: synapse

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.