This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:"
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html
ZEN Photography est une équipe de photographes professionnels basée à Antananarivo, Madagascar qui a comme objectif de capturer en photos et avec soin l'histoire de votre vie.