Video: Myelin sheath yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Schwann hlwb
Ntxiv mus, dab tsi ua rau myelin sheath?
Myelin yog tsim los ntawm ob hom kev txhawb nqa hlwb. Hauv nruab nrab lub paj hlwb (CNS) - lub hlwb thiab tus txha nqaj qaum - cov hlwb hu ua oligodendrocytes qhwv lawv cov ceg zoo li txuas ntxiv ib puag ncig ntawm axons los tsim myelin daim tawv nqaij . Hauv cov hlab ntsha sab nraud ntawm tus txha caj qaum, Schwann hlwb tsim tawm myelin.
Ib tus kuj yuav nug, qhov myelin sheath nyob qhov twg? Cov myelin daim tawv nqaij yog ib qho txuas ntxiv thiab hloov pauv cov ntshav ntshav qhwv ib ncig ntawm cov hlab ntsha axon hauv txoj hlua khi [1]. Cov myelin daim nyias nyias pib los ntawm thiab yog ib feem ntawm Schwann hlwb hauv lub paj hlwb sab hauv (PNS) thiab cov hlwb oligodendroglial hauv lub hauv paus paj hlwb (CNS) (saib Tshooj 1).
Tsis tas li, myelin sheath yog dab tsi?
n. Lub hnab ntawv insulating ntawm myelin cov uas nyob ib puag ncig cov tub ntxhais ntawm cov paj hlwb lossis axon thiab uas pab txhawb kev sib kis ntawm cov hlab ntsha impulses, tsim los ntawm cov cell membrane ntawm Schwann cell hauv peripheral paj hlwb thiab los ntawm oligodendroglia hlwb.
Yuav ua li cas myelination tshwm sim?
Myelination . Myelination pib tom qab Schwann hlwb tawm ntawm lub voj voog ntawm tes. Cov protein sib txawv, cov protein proteolipid, ua haujlwm no hauv lub hauv paus paj hlwb myelin cov . Cov txheej txheem ntawm myelination pib los ntawm Schwann cell ua ntej nkag mus rau ntau ntu axon ib zaug (Daim duab 1 (a)).
Pom zoo:
Dab tsi tuaj yeem ua rau puas tsuaj rau myelin sheath?
Myelin sheaths yog lub tes tsho ntawm cov nqaij rog uas tiv thaiv koj lub paj hlwb. Yog tias koj muaj ntau tus kab mob sclerosis (MS), tus kab mob uas ua rau koj lub cev tiv thaiv kab mob ua rau koj lub hauv nruab nrab lub paj hlwb, koj lub paj hlwb puas tuaj yeem puas. Qhov ntawd txhais tau tias koj lub paj hlwb yuav tsis tuaj yeem xa thiab tau txais cov lus zoo li lawv yuav tsum tau ua
Dab tsi yog malignant peripheral sheath tumor?
Malignant peripheral nerve sheath tumors yog hom mob qog noj ntshav tsawg uas tshwm sim hauv cov hlab ntsha uas nthuav tawm ntawm tus txha caj qaum mus rau hauv lub cev. Malignant peripheral paj hlwb cov qog tuaj yeem tshwm sim nyob txhua qhov chaw hauv lub cev, tab sis feem ntau tshwm sim hauv cov nqaij sib sib zog nqus ntawm caj npab, ceg thiab pob tw
Oligodendrocytes ua myelin sheath li cas?
Oligodendrocytes ua qhov no los ntawm kev tsim cov myelin sheath, ib qho dawb thiab ci iab fatty khoom, uas yog tsim los ntawm 80% lipid thiab 20% ntawm cov protein. Txhawm rau ua li ntawd, oligodendrocyte txuas ntxiv ib feem ntawm nws daim nyias nyias mus rau lub axon thiab sib tw ib puag ncig nws yog li tsim cov qhwv ntawm myelin sheaths ncig txhua axon
Dab tsi yog qhov txhais ntawm myelin sheath?
: insulating npog uas nyob ib puag ncig lub axon nrog ntau txheej txheej ntawm myelin, uas tsis txuas ntxiv ntawm cov nodes ntawm Ranvier, thiab qhov ntawd ua rau kom nrawm dua uas lub paj hlwb tuaj yeem taug kev nrog lub axon. - tseem hu ua medullary sheath
Peb lub luag haujlwm ntawm myelin sheath yog dab tsi?
Muaj nuj nqi ntawm Myelin Sheath Lub myelin sheath muaj tus lej ua haujlwm hauv lub paj hlwb. Lub luag haujlwm tseem ceeb suav nrog kev tiv thaiv cov hlab ntsha los ntawm lwm qhov kev siv hluav taws xob, thiab ua kom nrawm dua lub sijhawm nws siv rau cov hlab ntsha mus hla lub axon