Qhov sib txawv tseem ceeb ntawm myelinated thiab unmyelinated paj fibers yog tias cov paj hlwb myelinated muaj myelin sheaths nyob ib ncig ntawm lawv thaum lub paj hlwb unmyelinated tsis muaj sheath. Tsis tas li ntawd, cov hlab ntsha impulse kis tau sai dua hauv myelinated paj fibers thaum nws qeeb qeeb hauv cov paj hlwb uas tsis muaj myelinated.
Ib lub paj hlwb muaj peb yam; xws li lub cev ntawm tes, dendrites, thiab axon. Nerve fibers yog cov txheej txheem ntawm cov paj hlwb. Axon yog ib qho ntawm cov paj hlwb. Axons nqa cov hlab ntsha impulses (kev ua haujlwm muaj peev xwm) deb ntawm lub cev hlwb ntawm lub cev, thiab lawv ua haujlwm sai. Ntxiv mus, piv rau dendrites, axons ntev. Feem ntau, ib qho axon muaj nyob hauv ib lub paj hlwb. Myelin sheath yog ib txheej insulating los yog npog tsim nyob ib ncig ntawm lub axon kom ceev cov hlab ntsha impulse kis tau tus mob. Schwann hlwb ua rau myelin sheath. Txawm li cas los xij, axons tuaj yeem yog myelinated lossis unmyelinated.
Dab tsi yog Myelinated Nerve Fibres?
Thaum ib lub axon muaj myelin sheath nyob ib ncig ntawm nws, peb hu nws lub myelinated axon los yog myelinated paj fiber. Txij li thaum myelinated paj fibers muaj ib qho hluav taws xob insulating npog, lawv cov hlab ntsha impulse kis tau zoo thiab ceev.
Daim duab 01: Myelinated Nerve Fiber
Tsis tas li ntawd, lawv muaj cov ntawm Ranvier. Vim hais tias ntawm cov nodes ntawm Ranvier, s altatory conduction ntawm paj hlwb impulse tshwm sim thiab qhov ceev ntawm kis tau tus mob. Thaum muaj myelin sheath, cov paj hlwb tshwm dawb xim.
Dab tsi yog Unmyelinated Nerve Fibres?
paj hlwb uas tsis muaj myelin sheaths nyob ib ncig ntawm lawv yog hu ua unmyelinated paj fibers.
Daim duab 02: Unmyelinated Nerve Fibers
Vim tias lawv tsis npog nrog cov txheej txheem hluav taws xob, lawv qhov kev xa tawm ntawm cov impulse qeeb dua li cov paj hlwb myelinated. Unmyelinated paj fibers yog grey xim.
Dab tsi yog qhov zoo sib xws ntawm Myelinated thiab Unmyelinated Nerve Fibres?
- Ob leeg muaj nyob rau hauv lub paj hlwb.
- Lawv ob leeg xa paj hlwb.
Qhov txawv ntawm Myelinated thiab Unmyelinated Nerve Fibers yog dab tsi?
Raws li qhov muaj thiab tsis muaj myelin sheath nyob ib ncig ntawm cov paj hlwb, muaj ob hom paj hlwb uas yog myelinated paj fibers thiab unmyelinated paj fiber ntau. Raws li myelin sheath ua raws li ib qho insulating npog rau myelinated paj fibers, lawv qhia ceev kis ntawm paj hlwb impulses thaum nws qeeb qeeb nyob rau hauv unmyelinated paj fibers. Tsis tas li ntawd, txij li myelin yog ib qho lipid, myelinated paj fibers tshwm nyob rau hauv dawb. Tab sis, unmyelinated paj fibers tshwm nyob rau hauv grey. Cov nram qab no infographic nthuav qhia qhov txawv ntawm myelinated thiab unmyelinated paj fibers nyob rau hauv daim ntawv tabular.
Summary – Myelinated vs Unmyelinated Nerve Fibres
Ib lub paj hlwb muaj peb yam xws li lub cev ntawm tes, dendrites thiab ib qho axon. Thaum lub axon yog myelinated, peb hu cov neuron li myelinated neuron. Axon yog cov txheej txheem sib luag ntawm cov neuron uas nqa cov hlab ntsha impulses tawm ntawm lub paj hlwb lub cev. Nws tseem hu ua paj hlwb. Thaum lub paj hlwb muaj myelin sheath nyob ib ncig ntawm nws, peb hu nws lub paj hlwb myelinated. Ntawm qhov tod tes, thaum tsis muaj myelin sheath nyob ib ncig ntawm lub paj hlwb, peb hu nws unmyelinated paj fiber. Myelin sheath tsim ib qho insulating npog. Li no, nws nce qhov ceev ntawm impulse kis tau tus mob. Yog li ntawd, myelinated paj fibers kis paj hlwb impulses sai tshaj unmyelinated paj fibers. Qhov no yog qhov txawv ntawm myelinated thiab unmyelinated paj fibers.
