Ectoderm - ichi chokunze mbeu rukoko

The ectoderm chikamu chero mhuka zvipuka zvine masero akawanda. Chete vamwe vane mamiriro ichi anodzokororwa chete panguva embryo kukura, nepo vamwe - hwose. Chii ectoderm?

Mhando utachiona akaturikidzana

Panguva ontogeny of zai rinokamukana kakawanda, kuti aumbe akaturikidzana inoverengeka masero pamusoro nguva. Panguva Kusiyanisa yavo paumbwe anoverengeka akaturikidzana muviri, iyo gare gare kuti kuumba kubva munyama, nhengo uye hurongwa. Ectoderm - chimedu rokunze germinal. Munguva kukura zygote zviri akaumba munhu wokutanga chokunze paiva masero. Yomukati shizha embryo akadana endoderm. Gare gare nayo yakatanga kubva kufema uye zvomudumbu nehurongwa. Kubva pakati utachiona rukoko - mitumbi kuumbwa kuti sokuti vanosunga muviri wose - mesoderm. Ndicho tsandanyama nemarunda, munyika marangwanda, rokubereka, kweropa uye excretory nehurongwa.

nomukaka zviri ectoderm

Ectoderm - a nucleation layer aumba masero inotaura uye nhengo dzose tsinga. inotungamirwa Its kunoitika panguva gastrula rwakazara. Tsinga pamusoro vertebrates dzinoratidzwa yakakwirira azvipire kukura. Inoitwa uropi uye musana, uyewo munhu fibers kuti anzwire kubva kwavari zvivako zvose muviri. Sense nhengo dzemuviri uye Switch nehurongwa tiri rakabva ectoderm. Sezvo mudumbu kubva chimedu rokunze wokutanga masero, anoumba chifukidzo. Chokutanga ndicho epithelial zvinyama ganda uye zvomudumbu hurongwa.

ectoderm kuti hydra

In coelenterates mhuka ectoderm - muviri rukoko kuti anoramba hwose. Funga nezvomuenzaniso maumbirwo ayo Freshwater hydra. Izvi zviviri-rukoko mhuka ane muviri chakaumbwa ecto- uye endoderm. Pakati pavo munhu gobvu ndiro intercellular fuma. ectoderm masero vari dzaisiyana mu chimiro, uye mabasa. Kokutanga ari Kushanduka unyanzvi hurongwa dzakadaro dzinooneka panguva vamiririri coelenterates.

The mamiriro ine ectodermal ganda-tsandanyama masero, izvo vanogona kubata. Pamusana navo, hydra zvinofamba sezvinoita Acrobat, akatendeuka inotsika pamusoro tentacles. Kana vachibatwa masero etsinga, izvo vakarongawo kuruvazhe rukoko womuviri, mhuka iri compressed. Izvi zvinoratidza dzepanguva basa. The rokunze rukoko iri dzinongoda zvenguva masero kuti inogona kuva chero mamwe marudzi. It rinotsanangura yakakwirira azvipire kuzoita Freshwater hydra. Zvinogona zvachose chidzosai muviri wako, kunyange kubva mushy ezvinhu.

Chii masero anopedza

Ectoderm - ndiyo yokunze rukoko iyo anoshumira yakavimbika nzira yokudzivirira uye kuvhima. basa iri rinoitwa masero anopedza. Zvinosanganisira mumwe Kamudzira ine mukati neshinda yakakoswa. Kana munhu wacho uchipfuura, iye anouya vasanonoka bvudzi. Somugumisiro, anopedza shinda unwinds uye zvakasimba inoruma mumuviri wake. Pamwe chete nayo nezvevanakomana zvine chepfu. Mitezo akuvara kushandisa feelers iri intestinal lumen, apo chiri kugaya. Zhinji mhando muramba vari ngozi kuvanhu. Unoshanda masero dzavo anopedza kunokonzera kwazvo kutsva, nokuvhiringidzirwa mwoyo uye kufema ezvinhu, uye dzimwe nguva kunyange miromo uye nokufa.

Saka, ectoderm ndiyo chokunze utachiona akaturikidzana, iro azvikuya kwacho vertebrates kuumbwa muviri cover uye nhengo dzose tsinga. In coelenterates ectoderm anoumba dzinoverengeka specialized masero: ganda, tsandanyama, zvenguva, tsinga uye anopedza.