Trigger Points: An Anatomical Substratum

Figure 1

Scheme of anatomical location of MTrP1, MTrP2, MTrP3, MTrP3.1, MTrP4, MTrP5, MTrP5.1, MTrP5.2, and MTrP6. Motor endplate locations correspond to MTrP1, MTrP2, MTrP3, MTrP3.1, MTrP5, MTrP5.1, and MTrP5.2. MTrP4 and MTrP6 are insertional trigger points. Observe on the left side that points 5 and 3 are regions that correspond to nerve insertional points. The accessory nerve and its branches are highlighted in yellow.