interesting:

Prospective Tests on Biological Models of Acupuncture

eCAM 2009 6(1):31-39; doi:10.1093/ecam/nem122

http://ecam.oxfordjournals.org/cgi/content/full/6/1/31

see "Figure 3":

http://ecam.oxfordjournals.org/cgi/content-nw/full/6/1/31/F3

"Figure 3. Just as the distribution of pheochromocytoma correlates with the distribution of sympathetic ganglions, the distribution of germ cell tumors correlates with undifferentiated cells in human body which are likely to be involved in the regulation of growth control and physiology as part of the ‘inner meridian system’. This distribution also correlates well with the chakra system used in yoga and acupuncture, suggesting a unified structural basis for chakra system and meridian system"