As Shubin did a couple chapters ago, the introduction to the noggin was straightforward and relatively easy - plates, blocks and rods. The diagram also helped in visualizing what these looked like. However, the topic of cranial nerves was a bit dry because of their repetitive functions and confusing paths around the head.
Starting at the very beginning of life - within the womb - was helpful, so I could almost see the head developing as time progressed. Before birth, arches are formed, which eventually become the cranial nerves which aid the head in sight, hearing, movement, feeling, etc. Arch genes are then turned "on and off" in order to form the appropriate nerves that would someday become part of the head. Because of the chapter "Handy Genes" two chapters ago, this was a bit easier to understand than I would have, and I liked that.
The little Amiphioxus also shows off a nerve that helps the worm control its body. Jelly-like substance surrounds it and provides support for the wriggling worm. It is interesting to know how a tiny worm might have nerves like ours.
~Megan Hsiao
Subscribe to:
Post Comments (Atom)
I completely agree with you megan, on how the subject of the cranial nerves became "a bit dry" (in your words). I think this subject really made Shubin sound really like a teacher more than a cool scientist. I still really liked this chapter though.
ReplyDelete