SamuwarKimiyya

Mesodam - shi ne mai precursor na da yawa gabobin da kyallen takarda

Yanayin halitta na juya wani kwayoyin halin da samuwar jam yadudduka. Irin wannan m iri dabbobi, kamar coelenterates da Sponges tsakiya kunshi kawai biyu yadudduka: da indodem, da ectoderm. A tsawon lokaci, da mafi m siffofin kwayoyin, akwai wani na uku takarda - da mesodam.

Mene ne mesodam?

Yanayin halitta na juya shi ne bi da bi ci gaba da tayi, wanda aka tare da wani yawan canje-canje a cikin ilimin halittar jiki da kuma ilimin halittàr jiki da nan gaba matasa kwayoyin. Mesodam - shi ne tayi ganye, wanda ke taka muhimmiyar rawa a cikin samuwar yawa gabobin da kyallen takarda. Irin m kwayar dabbobi kamar hydra, jellyfish, murjãni ko Sponges ba don kome ba kira bilayer dabbobi, t. Don. A kan aiwatar da ontogenesis an kafa biyu kawai jam yadudduka.

mesodam samuwar

A tsari na kwanciya tsakiyar jam Layer a daban-daban taxonomic kungiyoyin ne daban-daban. Akwai uku mafi kyau a san hanyar a cikin abin da kafa mesodam: da teloblastichesky, kuma ectodermal enterocoel.

1. Teloblastichesky mesodam tafarkin bunkasuwar hali na da yawa protostomes dabbobi, da kuma dogara ne a kan samuwar da blastomeres. Wasu daga cikin su kware a kwanciya tsakiyar jam Layer, wadda daga ƙarshe daukan nau'i na biyu a tsaye a layi daya tube. Wadannan kaset da kuma bayar da Yunƙurin zuwa mesodam.
2. enterocoel Hanyar ne fundamentally daban-daban a cewa precursor sel da mesodam samar da intussusception (invagination) tare da indodem. Wannan invagination Forms da primary hanji a nan gaba. A iyaka tsakanin biyu dogon zanen gado da ya rage indiscernible, kuma kawai bayan wani dogon lokaci tazara mesodam a matsayin mai raba Layer detaches daga indodem. Wannan hanya na ci gaba shi ne halayyar dabbobi kamar lancelet ko tarwada.

3. A Hanyar ectodermal mesodermal da wadannan iri dabbobi, kamar dabbobi masu rarrafe, da tsuntsaye da kuma dabbobi masu shayarwa (ciki har da mutumin). A kasa line ne cewa kawai indodem aka kafa bayan da invagination. Idan muka kwatanta hoto amfrayo a cikin mahallin, bayan gastrulation (samuwar invaginations na) da free sarari zai bayyana tsakanin ento- da ectoderm. Akwai kuma "toho" na ectodermal asalin Kwayoyin cewa ba Yunƙurin zuwa wani sabon Layer amfrayo.

A ilimin halittar jiki na mesodam

A cikin babban rawa a cikin samuwar amfrayo mesodam plays. Wannan shi ne mai kyau Juyin halitta alama, saboda bambanci a cikin ilimin halittar jiki na tsakiya jam Layer a daban-daban kungiyoyin na dabbobi amfani da systematics.

Idan muka yi la'akari da biyu a tsaye makada, wanda aka kafa ta teloblasticheskom yanayin ci gaba, da mesodam za a gabatar metamerically maimaita sassan. A dorsal gefe na kowane irin bel ne zuwa kashi somites, gefen - a kan nephrotomy da ciki - a kan splanchnotome.

Wace rawa mesodam? Human gabobin kafa daga mesodam

Kowane nucleation Layer ne mai irin precursor na sashin jiki da kuma tsarin tsokoki gaba kwayoyin. Topology kafa zanen gado sun fi mayar da kayyade su ƙaddara. Tun da mesodam -. Shin da talakawan iri Layer, shi ne ake nufi a cikin samuwar tsokoki da kuma gabobin, wanda ake dake tsakanin inuwõyi na wani mutumin da sadarin yadudduka na jiki. Me Tsarin da mesodermal asalin?

  1. connective nama samuwar ne kawai daya daga cikin mesodam Kwayoyin. Wannan masana'anta shi ne iyakar da ke tsakanin m da ciki yadudduka da kusan duk wani sashin jiki na dabba.
  2. Musculoskeletal tsarin da kunshi da kwarangwal da tsoka tsarin Har ila yau yana mesodermal asalin. A nan muna da hankali a ba kawai da kwarangwal tsokoki amma kuma tsoka garun jini, zuciya da kuma sauran kayan ciki da Tsarin. A kwarangwal wakilci a cikin mutane da yafi by kashi nama, kuma zuwa karami - na guringuntsi nama. Idan ya zo ga chordates, a wani tayi mataki, wanda yake da samuwar wani tsirkiya, daya ya kamata ba dame asalin axial tsarin da kashin baya. Idan karshen gaskiya ne na mesodermal asalin, da tsirkiya - shi ne kawar da hanji, wanda ke nufin cewa ta asalin aka alaka da indodem.
  3. Jima'i da excretory tsarin kuma kafa daga mesodam. Su ne a cikin mafi chordates suna da alaka da juna, sabili da haka, an kafa daga wannan jam Layer.
  4. Mesodermal asalin yana da jijiyoyi. Kamar yadda zuciya da jini ake kafa ta Kwayoyin na tsakiya jam Layer.

ƙarshe

Mesodam - shi ne wani hadadden tsarin a kan tsarin da tayi cewa, yana yiwuwa ya ba Yunƙurin zuwa yawa muhimmanci gabobin da kyallen takarda. Daban-daban taxonomic kungiyoyin na dabbobi, da samuwar da kuma ci gaban da tsakiyar ganye ne daban-daban, da kuma wannan shi ne daya daga cikin juyin halaye. A gaban mesodam maki zuwa uku-Layer dabba cewa shi ne mai ƙarfi ãyã daga m kungiyoyin.

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