quinta-feira, 19 de abril de 2007

Formação do Tubo Neural




1-Tubo neural
2-Cresta neural
3-Capa del manto
4-Capa marginal
5-Somito
6-Epéndima
7-Dermatoma
8-Miotoma
9-Raíz posterior del nervio raquídeo
10-Cadena simpática
11-Nervio espinal (raquídeo)
12-Raíz anterior del nervio raquídeo

www.puc.cl/sw_educ/neurociencias/esquemas/037.gif



Num estágio mais avançado do desenvolvimento da gástrula, inicia-se o processo chamado de neurulação. Este processo vai dar origem ao sistema nervoso central e periférico e ocorre simultaneamente com a formação de folhetos e a diferenciação da mesoderme embrionária para a formação dos órgãos ou organogênese.

Importância:

Formação do sistema nervo central
Fases da neurulação

Placa Neural - A ectoderme dorsal do embrião sofre um espessamento e forma uma placa que é denominada placa neural.
Goteira Neural - a placa neural se aprofunda e passa a ser chamada de goteira neural
Sulco Neural ­- Ao longo do dorso da gástrula, o ectoderma sofre uma depressão, originando uma espécie de canaleta — o sulco neural.
Tubo Neural - posteriormente, fecham –se os bordos, formando um canal — o tubo neural. O tubo neural deverá originar todo o sistema nervoso central do organismo que se formará. Na parte anterior o encéfalo e na parte posterior a medula.
Notocorda Ao mesmo tempo, na parte mais alta do endoderma, ocorre uma evaginação longitudinal, agregará células de tecido conjuntivo fibroso formará um bastão que percorrerá toda a extensão dorsal do embrião no plano crânio-caudal. Este bastão sustentará o embrião e orientará a formação da coluna vertebral futura.
Obs. Em peixes, anfíbios, répteis, aves e mamíferos, a notocorda vai sendo gradativamente substituída (célula a célula) por tecido ósseo, ser constituída, por substituição, a coluna vertebral. Com a formação da coluna vertebral haverá o englobamento do tubo neural, a futura medula raquiana ou espinhal.

http://www.ficharionline.com/ExibeConteudo.php5?idconteudo=5397

11 comentários:

Anônimo disse...

You can choose a nice wall art or an interesting lighting fixture to make your bare walls look alive.
One of the most recommended living room decorating ideas is placing elegant lamps in the living room.
Most bedroom decorating tips tend to be quite generic, i.


Here is my weblog: www.topbedroomdecoratingideas.com

Anônimo disse...

You can then place an order for the cake. Go all out and pursue that vision you have
of a perfect wedding cake. If you are having your summer wedding
reception outdoors, buttercream is not your best choice.


Feel free to surf to my web blog; valentine cake ideas hearts

Anônimo disse...

These brushed silver frames would blend in nicely with any
of the above centerpieces and they make great favors.
Church wedding decorations are naturally more conventional
than the decorations you would find at another venue,
such as city hall or a hotel ballroom. Far too often brides decide they want a particular wedding theme and they stop there.


Here is my web page :: rustic wedding decor ideas

Anônimo disse...

Fine way of explaining, and nice piece of writing to obtain information about my presentation subject, which i am going to present in university.


my page: quantim

Anônimo disse...

Pick a fish like salmon, tuna, or mackerel. This will help build muscle under the skin, filling
it out and helping reduce sagginess. For this reason, these drinks should be consumed moderately
whenever losing excess fat is sought after.

My web-site; green tea weight loss study

Anônimo disse...

An example, the monogram CSA might be used for Chris and Amy Smith.

Make your wedding exceptional by choosing a professional wedding florist to add to the charm of
this enchanted day. Georgina Clatworthy is a dedicated full time writer who
composes informative articles related to wedding favors and wedding.


Here is my web site; http://www.topweddingdecoratingideas.com/ideas/preview/1343/sellnewusedweddingdecorvasescandleswholesaleweddinggirlca.html

Anônimo disse...

Cabbage soups are considered best option for losing weight and they are easy to
prepare as well. Participants should try to make it fun-filled so as to
find it enjoyable. She uses a trainer and a nutritionist to help with diet.



My homepage: http://auk.360bookmarks.com/technology/wiki-valiantentertainment-com/

Anônimo disse...

Neat blog! Is your theme custom made or did you download it from somewhere?
A design like yours with a few simple adjustements would really make
my blog stand out. Please let me know where you got your theme.
Thank you

Look at my website - quantrim facts

Anônimo disse...

Yes! Finally something about zoogamy.

Also visit my homepage - paingone pen review

Anônimo disse...

Unquestionably believe that which you said. Your favorite reason seemed to be on the web the easiest thing to be aware of.
I say to you, I certainly get annoyed while people consider worries that they plainly do not know about.

You managed to hit the nail upon the top and also defined out
the whole thing without having side effect , people
can take a signal. Will likely be back to get more. Thanks

Also visit my weblog; where to buy quantrim

Anônimo disse...

Producing bouquets fоr mmy wedding!

You'll not be disillusioned. ӏn the event
yoս're the kiond tߋ ɡive absent poinsettuas ԝithin the vacations, yߋu are able to fill up.
Want tߋ visit Dahlia Dell іn San Francisco's Goldsn Gate Park, јust
east οf the Scam...

Backyard photo-journalist ɑnd writer Debra Leee Baldwin demonstrates ɦow еxactly tߋ combine red, liime and green succulents іn a wide, low box.
Using intelligence and hilarity, backyard photojournalist P.
Luscious flower designer Melissa Teisl оf
Chicweed crops ɑ hanginjg basket սsing а beautiful aand lush choice оf succulents.


"Sluggish Blossoms: Four Months of Locally Grown Flowers in the... There have been lots of wonderful flowers nevertheless theyare not at all any cheaper when compared to a florist or trader joes... We invested sixtyDOLLAR on SEVERAL many of plants and baby's air on Weekend. All of it comes together fast. They have really good prices likewise, particularly on orchids.Parking is actually straightforward... you can either park to the block, or they have a paid parking lot. I enjoy love love love love plants!
san francisco florist
financial district

Тhiѕ yearis Bay Area Flower and Gardewn Demonstrate, fгom Friday tߋ
neхt Solar is creatingg upto ƅe consiidered а regular celebration, spurred
Ƅy subjects ʝust likе thhe drought, Ca people аlong with аn increased focus onn domestically ɑnd
sustainably produced bouquets, ρarticularly fгom California.Тhе exhibit's brand-new Flower Pavilion Phasde is
headed Ƅy Debra Prinzing, author оf seven guides, including "The fifty-Mile Aroma," аs well аs the nation's top
advocate fоr American-grown bouquets. Үou've to
tгuly hɑve a seller bannedr to acquirre earlier սse of the bouquets neѵertheless.
Andd sο I cаn not advise ɑ shop ߋver another.Theƴ еven haνe affordable backyard blooms, shrubbery, ɑnd
woods. Sansevierias ɑгe suculents ѡith haed gree leaves ѕometimes banded having a lighter green аnd/or edged in creamy orange.
Lots ߋf great community flower farmers іn addition to remarkable middlemen.

Discover ots օf great recommendations-- including Һow to deal with cactus ԝithout having the thorms inside your fingers!
Mаke ѕure yyou сome fiгst if үߋu woulԀ like to obtain moire
variety. We loved strolling thгough Һere. Prinzing,
along ѡith the California Cut Flower Commission аnd fresh bloom
display proprietors Sherry Larsen аnd Maryanne Lucas,
Һas created a community ѡhere readders can observe...moгe »

California may be the largestt maker ߋf flowers wіthin the United Stɑtes.
This іs ɑctually tɦe best spot fоr plants ɑnd flowers!

san francisco florist
Regarding college, tɦey ofver the lowest priced
orchid lеі, likie double-stranded fօr MONEY12-$20ORper lei.And
do not actually purchase parking. ward-winning backyard photojournal.

Floral styles, metods аt Garden Show and Bay Arеa Flower - SFGate


"Slower Plants: Four Times of Locally-Grown Arrangements from your Garden, Meadow and Farm" (E.
Lynn's; $16.95). $30 to geet ɑ FIVEA gardenia woods. Tɦere's alwаys
community parking ɑlso on the busy Weekend morning.