Neurula - he kahua o ka embryo ulu

Kekahi o na manawa o ke kanaka? Acaeoey o meaola - ontogenesis mea embryogenesis. Ua nā ka manawa, mai ka hoomaka ana mai o ke kahua o ka zygote ma mua o ka hānauʻana meaola, a he o kekahi mau successively hele kūlana. Kekahi o ia mea neurula. 'O kēia ke kahua o ka? Acaeoey o vertebrates, e hiki aku ai i ke kahua o ka embryo, me ia nōʻakolu germ mau papa, e like me ka neural Tube. Eia kekahi, no ka kekahi mau pule ma ka embryo e hana ana i ka papa kuhikuhiE mall oihana mua o nā mea a pau o ka Central a me kaʻike ākea ko mākou hopohopo kahua. Ma kēia 'atikala i nā hiʻona o nā ke kahua, a me ka physiological keʻano o ka hanaʻana lawe ana wahi i loko o ka mea, ua noonoo.

Kahua o ka hoʻonaʻauao o embryonic? Acaeoey

Full a me kaʻaʻahu palaoa zygote placental mammals, i nā kanaka, e hiki aku ai i ke 'ole e ku pono e like me ka berry silika a raspberry. Ua ua kapaʻia he morula. A laila kona keena hoonohonoho i loko o kekahi papa, a me ka hana blastula. Kēia puha eke, nā pā pōhaku o i i hana blastomeres-keena. Next, he kaʻina o ka invagination, kūpono ma keʻano o ka papalua, ahu iho o ka embryo. 'O kēia ke kahua gastrula. Ua ninoieo o ectoderm a me ka endoderm, a mai ka iniiaiie waha, kapaʻia ke kapa o ka blastopore. A laila na kihi i paʻa, a me ka fetus i ke ano o ka papalua, ahu iho o ka eke. Mahope complications ma ka embryo 'ole e pili ana i ka ikea ana o kekahi, ke kolu, ka germinal, ahu iho - mesoderm e moe ana ma waena o ka ecto- a me ka endoderm. Kona hoʻonaʻauao i loko o kanaka embryogenesis i kona iho i Kekahi Mau '. Mākou e hoʻopaʻa haʻawina ia i loko o au mamuli.

ho okumu ana o mesenchyme

Kanaka embryo i loko o kona lua 'ano apau loa kaʻawale kīloi paʻewa keʻano o ka hanaʻana - somites pahaʻekeʻeke. Ka mea, i loko mai o ka primitive gut pa. Mai ka ulu mesoderm, a somites mea lawelawe 'ana i ka hōʻailona no ka luna organogenesis. I hana i ka'ōnaehana i ka loa nui nā hale: notochord, liʻiliʻi a me neural Tube. Ka mea, i kapaʻia iho nā loko. Germ o complicating kona 'ole, hana i ka hou ke kahua - neurula. Ua lawe wahi ma luna o 3 - 4 pule o ka hāpai keiki. Keʻano papa hana o ka ho okumu ana i olelo kiekie embryo ke kahua a kūkākūkā hou.

E like me ka embryo ikeia neural Tube

Ka mawaho kuina germinal - ectoderm, ma kaʻaoʻao dorsal o ka fetus i oi anuanu a me ka mānoanoa o ia mea, a ua hoohuliia mai i loko o ka neural una. i hoalaia kona kihi mai, ho okumu i mau rollers. Ma waena o ia mea, he ma kai, a laila e hoano hou ana i loko o ka lua o ka lolo a me ka spinalʻaha piha me ka lama. Neural una pani kona kihi, mua i loko o ka cervical māhele o ka embryo, ka embryo, a laila, hoʻi ma ke kino iho (axis). Ke Aloha a me ka panina o ka neural papa i loko o ka cranial loa ma ka ulu lolo vesicles - ka lā mua o ka lolo. Ma 4 pule o ka hāpai keiki, ka neural Tube mea pono segregated mai ka ectoderm. No ka mea, neural Tube i hana nā aʻalolo keena, a trophic'aʻaʻa - ia lŘlŘ neurula a me ka neuroglia. 'O kēia ke kahua o embryonic? Acaeoey, a he ekolu germ papa a me neural Tube. Pehea hiki mai ka mea i hana i ka kanaka ko mākou hopohopo'ōnaehana?

Ke kūlana o neural lapa ho okumu i loko o ka'emi ko kahua

Koke ma hope o ka hui rollers a me ke ano o ka neural Tube i loko o ka Central haʻawina a me ka cutaneous ectoderm hookaawale i ka pae ana o aeee. Ua Ua Aia ma ka iho (axis) o ka embryo kino ma waena o ka pahale mawaho, ahu iho, a me ka embryonic neural Tube ua kapaia ka neural nalu. Kona ke kelepona hele hehee wale i ka hanana hiʻona. Kēia mea - ka hiki e neʻe i wahi likeʻole o ke kanaka embryo. No ka laʻana, kekahi o ka embryo keena hoʻoneʻe malalo iho i loko o ke kino a me ka palapala neurocytes a me neuroglia ganglia o kōkua aloha a me ka parasympathetic māhele o kaʻike ākea hapa o ka'emi ko kahua. Other keena noho ma ka neural nalu, initially ho okumu i ka ganglion mau papa, i mea kino a lilo iho i loko o aka wahi 31 hui o spinal nā aʻalolo. Ma keia kaʻina neurulation i pau, a he mea i hou hou ana o nā māhele o ka Central a me kaʻike ākea ko mākou hopohopo kahua.

Ka ulu ka manaʻo pohihihi o ka 'ole o ka embryo ma ke kahua neurula

Migrating neural nalu keena, HEN, mai waena hapa aʻe i ka sacralʻaha pauku ma ka 27 - 28 somites, i ka hiki i ka differentiate, i meaʻano nui'ālike polustvolovym keena o ka iwi ka lolo. E hoʻomaka ana mai o ka kela hapa o ka diencephalon a hiki i ka sacral kāleka embryo i 27 - 28 somite hui, i ke kahua o ka oo neurocytes a me glial keena o ka cranial nä olonä a me ganglia o ka auditory a me ka vestibular i hoʻomākaukauʻia. Ma keia kahua o embryonic kūpono 'ana i loko o ka laulā, mai 1 a hiki i 7 somite nā mea loaʻa lapa hoʻomaka i ke kahua o autonomic ganglia innervating ka naau, maʻiʻaʻai, liʻiliʻi a me nā loko o ka embryo pelvis. E hoʻopiha i ka maturation o ka'emi'ōnaehana mea i ka 40 pule o ka hāpai keiki.

Ke kumu no ka poʻe Polenekia o neural nalu keena

Ma muli o ka luna ana no keʻano o ka hanaʻana o ka ua'emi oihana, he ninau maoli aicieeaao: pehea la oukou e wehewehe i ke kumu no ka neʻe maila i ka neural nalu keena ma lōʻihi mamao ma ka kino o ka fetus? Hoikehonua, embryology wehewehe ia penei. Mua, neurula - he kahua o ka embryogenesis a neural nalu keena lilo aku i ko lakou hiki ke hoopili aku, oa kamaʻilio ana me kekahi i kekahi ... Ka lua o ke kumu ke moe i loko o ka Nine Inch haku mele 'ana o ka extracellular mua o ka embryo. Ua Ua haku o hyaluronicʻakika a me nā polokina: collagen, laminin, fibronectin ka tropism no neural nalu keena.

Lākou pilina me ka extracellular'ōpū mai a me ka poʻe Polenekia ia lŘlŘ ma muli o ka hōʻikeʻana i nā lātoma - integrins, e like me ke alo i loko o ka somites neurula kūikawā glycoproteins: tenascin a me T-cadherin. A pau i kēia e hōʻoiaʻiʻo i ke kūpono 'ana o ke kumu nui loa o ka ua'emi'ōnaehana o ka embryo.