I keep confusing these two. Below is a Bouras card that kept confusing me but I want to double check, is that supposed to say "ectoderm" rather than mesoderm? What I thought was
Neural Tube: Ectodermal. Will eventually become the spinal cord.
Notochord: Mesodermal and will induce the formation of neural plate->neural tube of the ectoderm
If there's anything else to know about these let me know.
I’m reading that the notochord is mesoderm but the nervous system as a whole is ectoderm. I’m just confused because I swore I read somewhere that the brain and spine derive from ectoderm, but isn’t the notochord the original CNS? Do we just pick ectoderm for the nervous system unless the notochord is specifically called out?
Which is it? Thank you.
Let's assume we're talking about the family "Branchiostoma."
Hey r/zoology! I have here a picture of a lamprey larva I took (which was turned into a composite image by some kind redditors. I know it's out of focus at the anterior end but could you guys please try to highlight the notochord for me? It's for a project at uni and I am having trouble with it (because it won't be covered in lectures for a few weeks and the project is due Monday). I have my Zoology textbook in front of me but it's not much help.
Also if you could clarify the location of the endostyle (the thing underneath the gill slits which is a tad thicker than everything around it?)
Hello, I had a question about embryology. Specifically, the notochord development.
Initially it starts fused with the ectoderm at the primitive streak. At this time it is a hollow canel. Midway it fuses with the endoderm and is termed "notochord plate". eventually, it seperates from the endoderm and becomes filled. this is the final notochord.
I was wondering, does this thing still remain attached to the ectoderm at the primtive pit? Or is it a tube of cells in the mesoderm that is no longer attached to the ectoderm and endoderm?