Qhov Tseem Ceeb Qhov txawv - Schwann Cell vs Myelin Sheath
Neurons (paj hlwb) yog cov hlwb tseem ceeb ntawm lub paj hlwb. Ib tug neuron muaj peb yam tseem ceeb: dendrites, cell lub cev, thiab axon. Dendrites tau txais impulses thiab dhau mus rau axon thiab xa mus rau dendrites ntawm cov neuron tom ntej. Axon yog qhov nyias ntev ntawm cov neuron uas siv cov ntaub ntawv tawm ntawm cov neuron. Nws yog tsim los ntawm ib qho txuas ntxiv ntawm cov paj hlwb cytoplasm. Axons tau qhwv rau hauv cov hlwb tshwj xeeb hu ua Schwann hlwb rau qhov ua tau zoo thiab nrawm ntawm cov teeb liab kis. Schwann hlwb nyob ib ncig ntawm lub axon, thiab muaj qhov sib txawv me me ntawm txhua lub cell. Schwann hlwb tsim ib daim ntaub nyob ib ncig ntawm lub axon, uas yog hu ua myelin sheath. Yog li, qhov sib txawv tseem ceeb ntawm Schwann hlwb thiab myelin sheath yog Schwann hlwb yog cov peripheral paj hlwb hlwb uas tsim cov myelin sheath nyob ib ncig ntawm lub axon thaum myelin sheath yog ib qho hluav taws xob insulating txheej qhwv nyob ib ncig ntawm lub axon, uas ua rau kom ceev ntawm hluav taws xob conduction.
Schwann Cell yog dab tsi?
Schwann cell (tseem hu ua neurilemma cell) yog ib lub xovtooj ntawm lub paj hlwb peripheral uas tsim cov myelin sheath ncig lub neuron axon. Schwann hlwb raug tshawb pom los ntawm German physiologist Theodor Schwann nyob rau hauv lub xyoo pua 19th; Yog li ntawd, lawv tau muab lub npe hu ua Schwann hlwb. Schwann hlwb qhwv lub axon thaum khaws qhov sib txawv ntawm txhua lub cell. Cov hlwb no tsis npog tag nrho axon. Unmyelinated qhov chaw tseem nyob hauv axon ntawm cov hlwb. Cov qhov khoob no hu ua nodes ntawm Ranvier.
Daim duab 01: Schwann Cells
Tsis yog tag nrho cov neuron axons tau qhwv nrog Schwann hlwb. Axons yog qhwv nrog Schwann hlwb thiab insulated nrog myelin sheaths tsuas yog thaum lub ceev ntawm hluav taws xob teeb liab uas mus raws lub neurons yuav tsum tau nce. Neurons nrog Schwann hlwb hu ua myelinated neurons, thiab lwm tus hu ua unmyelinated neurons. Schwann hlwb ua lub luag haujlwm tseem ceeb hauv kev ua kom ceev ntawm cov teeb liab kis tau los ntawm cov neurons. Li no, Schwann hlwb raug suav hais tias yog kev txhawb nqa tseem ceeb ntawm cov neurons.
Myelin Sheath yog dab tsi?
Myelin sheath yog ib txheej hluav taws xob rwb thaiv tsev qhwv ib ncig ntawm axon uas ua rau kom ceev ntawm hluav taws xob conduction. Myelin sheath yog tsim los ntawm cov khoom hu ua myelin. Kev tsim tawm ntawm myelin sheath hu ua myelination lossis myelinogenesis. Myelin yog tsim los ntawm cov hlwb tshwj xeeb hu ua Schwann hlwb ntawm lub paj hlwb peripheral. Tsis yog txhua axons muaj myelinated sheath nyob ib ncig ntawm lub axon.
Daim duab 02: Myelin sheath ncig ib axon
Myelin sheath yog tsim nyob ib ncig ntawm lub axon hauv kev ua kom zoo nkauj. Myelin tsim cov hlwb Schwann khaws qhov khoob thaum muab cov myelin nyob ib ncig ntawm axon. Lawv yog cov nodes ntawm Ranvier thiab lawv tseem ceeb rau kev ua haujlwm ntawm myelin sheath. Myelin sheath tsim ib qho kev tiv thaiv npog nyob ib ncig ntawm lub paj hlwb axon thiab tiv thaiv kom tsis muaj hluav taws xob teeb liab. Nws kuj ua rau kom ceev ntawm kev sib kis ntawm cov paj hlwb.
Kev sib raug zoo ntawm Schwann Cell thiab Myelin Sheath yog dab tsi?
Myelin sheath originates los ntawm thiab yog ib feem ntawm Schwann hlwb ntawm peripheral paj hlwb
Qhov txawv ntawm Schwann Cell thiab Myelin Sheath yog dab tsi?
Schwann Cell vs Myelin Sheath |
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| Schwann cell yog ib lub xovtooj tshwj xeeb ntawm lub paj hlwb peripheral uas tsim cov myelin sheath nyob ib ncig ntawm lub axon ntawm cov neuron cell. | Myelin Sheath yog ib qho insulating npog uas nyob ib puag ncig lub axon kom ceev cov hlab ntsha impulses uas taug kev raws axons. |
| kev sib raug zoo | |
| Schwann hlwb yog ntau hom glial. | Myelin sheath yog tsim los ntawm cov khoom hu ua myelin. |
Summary – Schwann Cell vs Myelin Sheath
Axon yog qhov nyias thiab ntev ntawm cov paj hlwb, uas coj cov teeb liab hluav taws xob tawm ntawm lub cev hlwb. Nws yog ib qho tseem ceeb ntawm cov paj hlwb. Qhov ceev ntawm cov hlab ntsha impulse mus los ntawm neurons yog nce los ntawm kev tsim ib txheej insulating nyob ib ncig ntawm lub axon. Qhov no yog hu ua myelin sheath. Myelin sheath yog tsim los ntawm cov hlwb tshwj xeeb hu ua Schwann cells. Schwann hlwb qhwv ib ncig ntawm lub axon thiab tsim cov myelin los ua myelin sheath. Qhov no yog qhov txawv ntawm Schwann cell thiab myelin sheath. Schwann hlwb thiab myelin sheaths yog qhov tseem ceeb rau kev ua haujlwm zoo thiab muaj txiaj ntsig ntawm cov paj hlwb impulses los ntawm neurons.
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