the forebrain, and hindbrain, dont merge during development, and they are not derived of radically different cells, and they originate from the same process. the difference between them is expressive regulation.
wikipedia being what it is, on par with secondary literature gives an overview of brain and nervous system origin.
the primary discipline is embryology, and if you view the progression from cellular to somatic, it is quite clear that structure of nervous system, and brain are early events during organogenesis, and are derived from contact and signalling between cellular plates. there is a gradient derived signal, that induces disparate potency of genetic expression. there is however, not , two individual centers of cellular genesis, all neural cells are derived from same cell cell interaction, and induced to take a constrained set of functionalities based on signal amplitudes.
the original research in question did not discover a two brain merger, thats a tragic misinterpretation that is doing disservice, and is not even the claim of the research.
the discovery is the difference in genetic expression that required a different cultural regime for hindbrain neurons invitro. previously the paradigm was that forebrain, and hindbrain required almost similar culture, and this discovery allows realization of that fact, leading to a cultural regime promoting invitro hindbrain neuroculture.
>the original research in question did not discover a two brain merger, thats a tragic misinterpretation that is doing disservice, and is not even the claim of the research.
And after they discovered this I'm assuming another group of researchers did a genetic overview of when this feature would have split off from the evolutionary tree and we see it was over 500m years ago in dual networked organisms.
this is not the claim made by the researchers generating this paper.
this is thier claim :
“We’ve shown for the first time that the front of the brain arises from a totally different progenitor cell than the back of the brain,” said Kyle Loh, PhD, associate professor of developmental biology. “Our discovery means that we can now grow neurons from the back of the brain, the hindbrain, in a petri dish and study their functions.”
in translation, the two regions of the brain develop from different expressive states of the progenitor populations. the problem was difficulty culturing cerebellar neurons, due to a unrecognized disparity in genetic expressivity. the neurons were being manipulated as if they were running the same config.sys, and that was not the case. this work elucidates that fact and recognizes it as essential, to invitro culture of "hindbrain" neurons.
The findings were published in Nature Neuroscience Sept. 18. Loh is the senior author. Graduate students Carolyn Dundes and Rayyan Jokhai are co-first authors of the research.
Does this help explain why the circuits that control emotional crying, which rely on connections that span the anterior, posterior and midbrain, develop?
these are not separate organs these are separate "stem cell" populations.
under such a statement as submitted all of our organs that derive from varied populations of expressive constituency, would be amalgams of more than one organ.
a bit late chiming in, but, this is not a naive question. the definition of organ precedes developmental genetics, as a collection of tissues composing a structural unit, fullfilling a distinct function. its a sloppy definition in the contemporary, but what it does do is provide definition with respect to organizational level.
the gist is that an organ is localized structure you can point towards, where as a diffused system, such as nervous system , requires a sweep of the hand, as it is distrubuted over the volume of the organism.
the "common function" is the floor of the definition.
what is clear from embryological study is that neural tissue is derived from communication between two embryonic cell plates, and the result is modified based on spatially based inductive signal consequences for gene regulation.
these are not two separately derived organs later fusing to one mass, these are different regions of the same mass having different consequences of inductive signal.
because people who actually work are stronger and more astute at expedient improvisation than an administrative deskclod. it may not seem like it but there are many more of "us" than they, and thier cronies. the pushback at flock cameras is a tip of an iceberg.
>Unsecured residential wifi connections aren't much of a thing anymore<
most residential wifi are not very secure, put the black hat on for a second, then send a message telling a user there is something they cant have; cant do; or will lose, unless they log in, or sign in. then you see the joe password, and many times its the same password for everything.
the better direction in my opinion, is the mutual reinforcement of coupled dynamic systems, that ends up giving us metabolism.
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