a - by volar surface of the distal phalanx of the middle
finger
b - by both thumbs
c - by bending index finger
F. MAIN AREAS FOR PM. In Fig. 76-80, we show the location of the most useful chief
trigger points in the periosteum of different parts of the human
body. The practical application of them will be discussed below in
the sections dedicated to special disorders. The reader can also find
in that section information about the innervation of these parts of
periosteum (sclerotomes).