>Again, I think there
> is a confusion between dermal and ectodermal. AFAIK all vertebrate bone
> is mesodermal in origin.
Read: http://dev.biologists.org/cgi/reprint/117/2/409.pdf
These guys claim that the top of the skull is derived from neural
crest tissue, which is ectodermal. I Googled the topic. Some say the
parietals are ectodermal, some say that it is mesodermal. I think the
ectodermal origin may be still controversial. I am not so sure anymore.
