This chapter, like all the other chapters, made a connection between a certain part of our body to that of a simpler creature. Shubin talked about how our skull in particular had the same basic structure and blueprint as a shark and even a headless worm. I found it interesting when he stated that though our head was filled with complex nerves, it has a pattern that makes our head simpler to understand. It was interesting to see that the four arches that form when embryos are developing resemble the gills in shark embryos, and can even connect to worms. Each arch is composed of different cells that create different parts of our skull. And nerves like the facial and trigeminal supply certain structures that developed from a certain arch. These four arches that form in embryos allow scientists to connect human heads to the heads of sharks and other simpler creatures.
-Sarah You
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