If you like this, there is a whole flickr set called Street Anatomy dedicated to anatomical tattoos.
Female reproductive system tattoo.
Baby fetus tattoo.
Heart cancer tattoo designed by Leah Neuhauser.
This tattoo represents a nice chunk of skin removed to reveal the anatomy below.
Skeletal back tattoo.
Arm muscles tattoo.
Wrist anatomy tattoo illustrated by medical illustrator, Karen Bucher.
Chest muscle tattoo.
X-ray fetus tattoo.