Video: Myelin yog dab tsi Myelination txheej txheem sib txawv hauv CNS thiab PNS?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Myelin ntawm CNS yog tsim los ntawm cov hlwb tshwj xeeb hu ua oligodendrocytes. PNS myelin yog tsim los ntawm Schwann cells. Ob hom myelin yog cov tshuaj sib txawv, tab sis lawv ob leeg ua haujlwm zoo ib yam los txhawb nqa kev sib kis tau zoo ntawm lub paj hlwb ua rau lub axon.
Ib yam li ntawd, nws tau nug, cov txheej txheem myelination txawv li cas hauv CNS thiab PNS?
Myelination muab hluav taws xob rwb thaiv tsev ntawm neurons. Hauv CNS ( lub hauv paus paj hlwb ) oligodendrocyte yog lub luag haujlwm rau myelination ntawm neuronal axons. Cov hlwb no muaj txheej txheem uas qhwv ib ncig ntawm axons los tsim myelin sheath. Hauv PNS ( peripheral paj hlwb ) myelin sheath yog tsim los ntawm Schwann cell.
Kuj Paub, vim li cas myelination muaj qhov tshwj xeeb ntawm cov neurons hauv PNS? Ntau yam zoo li cov rwb thaiv tsev nyob ib ncig ntawm cov xov hlau hauv cov tshuab hluav taws xob, glial cells tsim cov txheej membrane uas nyob ib puag ncig axons hu ua myelin , yog li insulating lub axon. Qhov no myelination , raws li nws yog hu ua, tuaj yeem ua rau kom nrawm ntawm cov teeb liab kis ntawm cov neurons (paub tias muaj peev xwm ua tau).
Ib yam nkaus, tib neeg nug, hom cell twg yog lub luag haujlwm rau myelination hauv lub hauv paus paj hlwb?
cov oligodendrocytes
Cov paj hlwb tau sov li cas nrog myelin hauv CNS?
Hauv PNS, hlwb npe Schwann hlwb tsim thiab tswj cov myelin hos, hauv CNS , lus hlwb hu ua oligodendrocytes tsim thiab tswj hwm myelin . Hauv Ntau Yam Sclerosis, tus myelin yog kev tshem tawm ib puag ncig ntawm lub axon uas ua rau qeeb paj hlwb impulses hauv tus txheej txheem hu ua demyelination.
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