Trigger Points: An Anatomical Substratum

Table 1

Anatomical location of the MTrPs in 12 cadavers (insertional MTrPs were not listed).

Trigger point	Specimens 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12/left and right side
MTrP1	Intermediate part of the anterior border of the upper part of the muscle near the vertical fibers of the muscle attached to clavicle
MTrP2	Distal and slightly lateral to MTrP1
MTrP3	Medial to the scapula and on the border of the medial fibers near the inferior border of the muscle
MTrP3.1	Medial fibers near the inferior margin of the muscle, medial to MTrP3; nervous branch always smaller than MTrP3 branch.
MTrP5	Medial to the scapula in the intermediate part of the muscle belly
MTrP5.1	Medial to the scapula in the intermediate part of the muscle belly inferior to MTrP5
MTrP5.2	Medial to the scapula in the intermediate part of the muscle belly inferior to MTrP5.1