Period+2+Nervous+Pictures

http://images.google.com/imgres?imgurl=http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19588.jpg&imgrefurl=http://www.nlm.nih.gov/medlineplus/ency/imagepages/19588.htm&usg=__tktx30k1AxrJKP741jVyLLFdt3U=&h=320&w=400&sz=27&hl=en&start=8&um=1&tbnid=uaHe_Ze8E0PioM:&tbnh=99&tbnw=124&prev=/images%3Fq%3Dnervous%2Bsystem%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG

http://en.wikipedia.org/wiki/Central_nervous_system Picture on the right.

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