Qhov Tseem Ceeb Qhov txawv - Oligodendrocytes vs Schwann Cells
Neuroglia lossis glial hlwb yog cov hlwb uas tsis yog neuronal uas txhawb kev ua haujlwm ntawm lub hauv nruab nrab thiab lub paj hlwb peripheral. Cov hlwb no tiv thaiv cov neurons thiab tiv thaiv kev poob ntawm cov teeb liab thaum kis los ntawm neurons. Glial hlwb nyob ib puag ncig cov neurons thiab tsim cov txheej txheem insulating nyob ib ncig ntawm axons. Muaj ntau hom glial hlwb. Lawv suav nrog oligodendrocytes, astrocytes, ependymal hlwb, Schwann hlwb, microglia, thiab satellite hlwb. Oligodendrocytes yog cov glial hlwb uas nyob ib puag ncig neurons ntawm lub hauv nruab nrab paj hlwb thiab insulate axons. Schwann hlwb yog cov hlwb glial uas nyob ib puag ncig neurons ntawm lub paj hlwb peripheral thiab insulate axons. Qhov sib txawv tseem ceeb ntawm oligodendrocytes thiab Schwann hlwb yog tias ib leeg oligodendrocyte tuaj yeem ncav cuag 50 axons thiab tsim myelin sheaths uas yog 1 µm ntev hauv txhua axon thaum ib leeg Schwann cell tuaj yeem qhwv ib ncig ntawm ib qho axon thiab tsim ib ntu myelin.
Oligodendrocytes yog dab tsi?
Oligodendrocytes yog glial hlwb uas thaiv cov neuron axons ntawm lub hauv paus paj hlwb ntawm cov vertebrates siab dua. Cov hlwb no tsuas pom nyob rau hauv lub hauv nruab nrab lub paj hlwb, uas muaj lub hlwb thiab qaum qaum. Oligodendrocytes yog cov tseem ceeb txhawb cov hlwb ntawm lub hlwb thiab qaum qaum. Lawv muaj ib lub cytoplasm me me nyob ib puag ncig ib puag ncig nucleus thiab ntau cov txheej txheem cytoplasmic ceg los ntawm lub cev ntawm tes.
Daim duab 01: Neuron nrog Oligodendrocytes
Oligodendrocytes tsim myelin sheaths nyob ib ncig ntawm axons. Myelin sheaths insulate lub axons kom tsis txhob poob ntawm cov teeb liab thiab nce tus nqi ntawm cov teeb liab kis tau tus mob. Ib qho oligodendrocyte muaj peev xwm tsim tau cov myelin sheath ntu rau txog 50 axons txij li cov txheej txheem cytoplasmic ntawm ib leeg oligodendrocyte tuaj yeem ncav cuag 50 axons uas nyob ib sab thiab tsim myelin sheaths.
Schwann Cells 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; li no lawv thiaj muab lub npe hu ua Schwann cells. 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 nyob nruab nrab ntawm cov hlwb hauv axon. Cov qhov khoob no hu ua nodes ntawm Ranvier.
Daim duab 02: Schwann Cells
Tag nrho cov neuron axons tsis 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 axons qhwv 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. Yog li ntawd, Schwann hlwb raug suav hais tias yog qhov kev txhawb nqa tseem ceeb ntawm cov neurons.
Dab tsi yog qhov zoo sib xws ntawm Oligodendrocytes thiab Schwann Cells?
- Oligodendrocytes thiab Schwann hlwb tsim myelin sheaths nyob ib ncig ntawm lub axons.
- Ob lub hlwb yog glial hlwb.
- Ob lub hlwb txhawb cov teeb liab kis tau los ntawm cov paj hlwb.
Qhov txawv ntawm Oligodendrocytes thiab Schwann Cells yog dab tsi?
Oligodendrocytes vs Schwann Cells |
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| Oligodendrocytes yog cov hlwb uas tsim myelin sheath nyob ib ncig ntawm axons ntawm lub paj hlwb. | Schwann Cells yog cov hlwb uas tsim myelin sheath ncig lub axons ntawm peripheral paj hlwb. |
| Lub luag haujlwm tseem ceeb | |
| Oligodendrocytes 'lub luag haujlwm tseem ceeb yog kev rwb thaiv tsev ntawm cov hlab ntsha axons nyob rau hauv nruab nrab lub paj hlwb. | Schwann Cells 'lub luag haujlwm tseem ceeb yog kev rwb thaiv tsev ntawm cov hlab ntsha axons hauv lub paj hlwb peripheral. |
| Axons | |
| Ib qho oligodendrocyte tuaj yeem ncav cuag 50 axons. | Ib leeg Schwann cell tuaj yeem qhwv tsuas yog ib qho axon. |
| Cov txheej txheem Cytoplasmic | |
| Oligodendrocytes muaj cov txheej txheem cytoplasmic. | Schwann hlwb tsis muaj cov txheej txheem cytoplasmic. |
Summary – Oligodendrocytes vs Schwann Cells
Oligodendrocytes thiab Schwann hlwb yog cov hlwb glial uas tiv thaiv thiab txhawb cov teeb liab kis tau los ntawm cov neurons. Ob lub hlwb muaj peev xwm tsim myelin sheaths nyob ib ncig ntawm cov neuron axons. Oligodendrocytes tsuas yog pom nyob rau hauv lub hauv paus paj hlwb. Lawv tsim myelin sheaths nyob ib ncig ntawm lub axons ntawm neurons nyob rau hauv lub hauv paus paj hlwb. Schwann hlwb muaj nyob rau hauv lub paj hlwb peripheral. Schwann hlwb tsim myelin sheaths nyob ib ncig ntawm lub axons ntawm neurons nyob rau hauv lub peripheral paj hlwb. Oligodendrocyte nyob ib puag ncig ntau axons thaum Schwann cell qhwv tsuas yog ib ncig ntawm ib lub axon. Qhov no yog qhov txawv ntawm oligodendrocytes thiab Schwann cell.
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