Ectoderm - kunjayu wosanjikiza mbewu

The ectoderm ndi mbali ya aliyense nyama multicellular chamoyo. ena Only dongosolo lino anakhalabe lokha pa chitukuko embryonic, pamene ena - moyo wonse. ectoderm ndi chiyani?

Mitundu ya zigawo nyongolosi

Pa ontogeny wa dzira ukugawa mobwerezabwereza, kupanga zigawo zingapo maselo pa nthawi. Pa zosiyanasiyana awo ndi mapangidwe zigawo zingapo za thupi, amene pambuyo ati apange ku zimakhala, ziwalo ndi kachitidwe. Ectoderm - chidutswa cha germinal lakunja. Pa chitukuko cha zygote izo aumbike kwa woyamba wosanjikiza kunja kwa maselo. Tsamba lamkati la mwana wosabadwayo lotchedwa endoderm. Kenako anayamba ku kachitidwe kupuma ndi m'mimba. Pakati nyongolosi wosanjikiza - mesoderm - anapanga matupi amene amaoneka kuti amange pamodzi thupi lonse. Ndi minofu ndi Mitsemphayi, mkati mafupa, ubereki, magazi ndi machitidwe excretory.

opangidwa kuchokera kwa ectoderm ndi

Ectoderm - ndi nucleation wosanjikiza, anapanga maselo lomwe lili ndi ziwalo ya ubongo. mapangidwe ake limapezeka pa siteji gastrula. Mantha dongosolo la inakhala yodziwika ndi mkulu mlingo wa chitukuko. Amakhala ubongo ndi msana, komanso ulusi munthu kuti kuyambira iwo kuti nyumba zonse za thupi. Ziwalo tanthauzo ndi machitidwe kachipangizo amagwiritsidwa anachokera ku ectoderm lapansi. Monga Ndisanaumbidwe akufotokozera kuchokera pa chidutswa cha wosanjikiza akunja maselo, ndipamene chophimba. Choyamba ndi minofu zaminyewa wa khungu ndi dongosolo m'mimba.

ectoderm wa hydra

Mu coelenterates nyama ectoderm - thupi wosanjikiza kuti amalimbikira mu moyo. Taganizirani chitsanzo cha kapangidwe ka madzi oyera hydra ake. Nyama ziwiri wosanjikiza thupi lake aumbike mwa ecto- ndi endoderm. Pakati pa iwo ndi wandiweyani mbale intercellular mankhwala. maselo ectoderm zosiyana mu dongosolo, ndipo ntchito. Kwa nthawi yoyamba mu zamoyo wa nyumba ngati apadera kuonekera pa anthu a coelenterates.

Kapangidwe tichipeza maselo ectodermal khungu minofu, okhoza kutenga. Chifukwa cha iwo, ndi hydra ikuyenda ngati Acrobat ndi anatembenukira zamadzi pa tentacles lapansi. Atadziŵa maselo mitsempha, amenenso imakonzedwa mu wosanjikiza kunja kwa thupi, nyama wothinikizidwa. Ichi ndi chiwonetsero cha ntchito reflex. Wosanjikiza akunja amadziwikanso oyenerera wapakatikati maselo akhoza lidzasinthidwa mitundu ina. Iwo amati mkulu mlingo wa ayambe madzi oyera hydra. Iwo akhoza kwathunthu kubwezeretsa thupi lanu, ngakhale boma mushy.

ndi maselo lobaya Kodi

Ectoderm - ndi wosanjikiza akunja amene akutumikira monga njira zodalirika chitetezo ndi kusaka. nchito imeneyi imagwiridwa maselo lobaya. Iwo zigwirizana wa kapisozi ndi mkati ulusi wopota. Pamene wovulalayo imadutsa, iye adza kwa tsitsi tcheru. Chifukwa, lobaya ulusi unwinds ndi mwamphamvu uyo mu thupi lake. Pamodzi ndi izo tikuuzidwa poizoni. Analumala wovulalayo ntchito feelers ali lumen wa matumbo, kumene kuli chimbudzi. Ambiri mitundu modabwitsa ndi oopsa kwa anthu. Ntchito maselo awo lobaya amachititsa zilonda zamoto, kusokonezeka kwa mtima ndi dongosolo kupuma, ndipo nthawi zina ngakhale malekezero ndi imfa.

Choncho, ectoderm ndi akunja nyongolosi zigawo, kumene ndondomeko mphero mu inakhala zooneka thupi chimakwirira ndi ziwalo ya ubongo. Mu coelenterates ectoderm ndipamene nambala ya maselo apadera: khungu, minofu, wapakatikati, mitsempha ndi lobaya.