yes, my degree is in embryology and genetics - vintage 1969!
but deparmebtal politics = my genetics prof hated my embryo prof -
and after three months of of fighting ,with both ogsf them -
plis the fact that i was the student rep; on the S2A3 committee with the
physiology prof who was at war with both of then ,,,,, i decided to bedcccome
a librarian.
butt i do, remember enuff, i think..
1 the haploid sperm and ova unite to form the diploid zygote.
2 these divide to form 2 cells, the again, 4, then 8 then 16. when there are
128 nor 256 cells, the division becomes ujewven, and thus sodoews ,the number
of cells. it is just a clump of undifferentiated cells. This my professor
called a 'clone' and he was able to 'clone' frogs
from this stage of a frog embryo.
3 the clone begins hollow out and forms a hollow two layer sphere called the
blastula blastosphere. the inner layer gives rise to the internal organs -
except the nervous system. the outer layer gives rse to the skin and the
nervous system.
atleast that is how it was described 30 years ago.
my prof was pretty well known, because tjhe text book he wrote was then being
used at the English college whose library i worked in, and also by a cousin of
mine who got his degree at no less an institution than Cambridge. Clare
College - he shaved at the same sink as crick of watson and crick so he must
be superior!!!
anyway that is my 2 cents worth
i couldnt sleep anyway
hilary (donmt forget deuteronomy 22 7)
Camilla Flintermann wrote:
>
> You are probably right Bill--I can't recall where I saw the zygote
> reference, but I well remember the cute little drawings of the blastula and
> later stages--of course those were *chick* embryos we had grown in the lab
> incubator. I loved embryology 'cause I got to draw all those pictures !
> :--)
>
> >Re: "Zygote"
> >
> >Camilla, you're really digging up my old embryology class! :-) I think
> >the zygote is a special entity in that it consists of the merged sperm and
> >egg before it begins to split into the cells that then form the blastula. I
> >would think that the zygote could only exist as such until it starts
> >dividing into the undifferentiated cells that make up the blastula. I guess
> >I'm going to have to get to a library and find a text on embryology.
> >
> >In my days we didn't call it an embryo until the cells had differentiated
> >and migrated into their relative positions..... i.e. the "tadpole" stage...
> >
> >
> >Whatdya think?
> >
> >Bill
> >
> >*****************************
> >
> >-----Original Message-----
> >From: Camilla Flintermann [mailto:[log in to unmask]]
> >Sent: Thursday, October 05, 2000 11:22 AM
> >To: [log in to unmask]
> >Subject: Re: Stem Cells = "Blastula" ?
> >
> >
> >Well, my embryology class was a looooong time ago---and you may be right,
> >but the stage I have seen cited is the zygote, a "cell produced by the
> >union of egg and spern":(acc. to Tabers' Medical Encyclopedia) which I
> >think would be even earlier than a blastula? Is this correct?
> >
> >
> >
> >
> >>Stem Cells = "Blastula" ?
> >>
> >>Is it not true that the best undifferentiated cells are to be found in the
> >>blastula phase of development?
> >>
> >>If I remember my college embryology from 35 years ago, (and if they haven't
> >>completely changed the field of embryology since then), the egg and sperm
> >>come together, begin to split and form a hollow sphere made up of cells....
> >>a blastula. At this stage the individuals cells can become anything,
> >>depending on chemical and other conditions and influences ("tropisms") to
> >>which they may become exposed.
> >>
> >>If the blastula is the best source of stem cells, then should the questions
> >>not be focused on the use of blastulas, not embryos. What say you?
> >>
> >>Bill
> >>PWP, New Jersey
> >
> >
> >Camilla Flintermann, CG for Peter 82/70/55
> >Oxford, Ohio
> > <[log in to unmask]>
> >
> > on PDWebring at
> >http://members.tripod.lycos.nl/genugten/flinterm.htm
> >
> > "Ask me about the CARE list for
> > Caregivers of Parkinsonians ! "
> > And visit the CARE webring at
> >http://www.crosswinds.net/~caregivers/index.html
>
> Camilla Flintermann,
> Oxford, Ohio
> <[log in to unmask]>
>
> on PDWebring at
> http://members.tripod.lycos.nl/genugten/flinterm.htm
>
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> # " Nothing is as inevitable #
> # as a mistake whose time is come." #
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