Encyclopedia of Pain

2007 Edition

Active Locus

Reference work entry
DOI: https://doi.org/10.1007/978-3-540-29805-2_49


EPN locus


The motor component of a Myofascial Trigger Point is the active locus, or endplate-noisy locus (EPN locus). From this locus, spontaneous electrical activity, known as endplate noise (EPN), can be recorded. It is related to taut band formation in skeletal muscle fibers.

 Dry Needling

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© Springer-Verlag Berlin Heidelberg 2007