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You Are An Upside-Down Lobster

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 Anatomy   |   Biology   |   Science
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Vote PBS Digital Studios for 'Best Science&Education Network' in the 2015 Webbys -- http://vid.io/xqjk
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Here's why you aren't built like a lobster.
Subscribe to It's Okay To Be Smart: http://bit.ly/iotbs_sub↓ More info and sources below ↓
Follow on Twitter: http://twitter.com/jtotheizzoe
Follow on Tumblr: http://www.itsokaytobesmart.com

Our bodies are mirror images of lobsters and other arthropods from back to belly. We've know since the early 19th century that our guts and nervous systems are inverted from theirs, but only recently has molecular biology shown us why. Here's the evolutionary tale about a worm doing the backstroke and why your guts are on your front.

This is part 2 of 3 in my series about how our bodies evolved to look like they do. Check out the others:
Part 1 - https://www.youtube.com/watch?v=qdNE4WygyAk
Part 3 - Coming Friday!

More info:

Dorsoventral inversion: http://en.wikipedia.org/wiki/Inversion_(evolutionary_biology)

Geoffrey Saint-Hilaire: http://en.wikipedia.org/wiki/%C3%89tienne_Geoffroy_Saint-Hilaire

Common animal body plan between protostomes and deuterostomes: http://www.hhmi.ucla.edu/derobertis/EDR_MS/Evo-Devo_page/EVO-DEVO.html

How we know that our body plan came later: http://scienceblogs.com/pharyngula/2006/01/12/hemichordate-evodevo/

Step by step along the evolutionary tree:
http://tolweb.org/Bilateria/2459
http://en.wikipedia.org/wiki/Bilateria
http://en.wikipedia.org/wiki/Deuterostome
http://en.wikipedia.org/wiki/Protostome
http://en.wikipedia.org/wiki/Urochordata
http://en.wikipedia.org/wiki/Chordate
http://en.wikipedia.org/wiki/Cephalochordata
http://en.wikipedia.org/wiki/Craniate
http://en.wikipedia.org/wiki/GnathostomataEvolutionary timeline of vertebrates: http://www.utexas.edu/news/2008/03/03/tree/

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Have an idea for an episode or an amazing science question you want answered? Leave a comment below!

Follow me on Twitter: @jtotheizzoe
Email me: itsokaytobesmart AT gmail DOT com
Facebook: http://www.facebook.com/itsokaytobesmart
Google+ https://plus.google.com/+itsokaytobesmart
For more awesome science, check out: http://www.itsokaytobesmart.com

Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc.
Kate Eads - Associate Producer
Katie Graham - Director of Photography
Andrew Matthews - Editor and motion graphics
John Knudsen - Gaffer


Music:
"Ouroboros" by Kevin MacLeod

Stock images via Shutterstock

Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

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Last week's video: Why Did We Blow on NES Games? https://www.youtube.com/watch?v=4Gf9mtXnJfM


More videos:
The Science of BBQ https://www.youtube.com/watch?v=ccqOVmsybO4
The Science of Game of Thrones - https://www.youtube.com/watch?v=Utu-LpJn3Is
The Far Future of the Universe - https://www.youtube.com/watch?v=Jl9DwNOonOA
There Was No First Human - https://www.youtube.com/watch?v=xdWLhXi24Mo
How The Elements Got Their Names - https://www.youtube.com/watch?v=mtg9p6A6xnY

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