Video: Cov nodes ntawm Ranvier yog dab tsi thiab vim li cas lawv tseem ceeb rau APs?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Nodes ntawm Ranvier yog kiag li tseem ceeb kom nrawm, ncaj ncees, thiab ua tau zoo AP kev coj ua hauv lub paj hlwb. Txawm hais tias cov no cov txheej txheem ib txwm tau saib yooj yim raws li kev txhawb nqa tsis pub dhau rau AP kev tshaj tawm, kev ua haujlwm tsis ntev los no tau pib qhia qhov ntawd nodes ua lub luag haujlwm tseem ceeb hauv kev tswj cov neuronal excitability.
Ua li no, vim li cas cov nodes ntawm Ranvier tseem ceeb?
Nodes ntawm Ranvier yog qhov khoob ntawm cov txheej txheej txheej myelin ntawm lub neural axon. Cov nodes ntawm Ranvier tso cai rau ions mus rau hauv thiab tawm ntawm cov neuron, propagating hluav taws xob teeb liab hauv axon. Txij li thaum nodes yog spaced tawm, lawv tso cai rau saltatory conduction, qhov twg lub teeb liab sai dhia los ntawm ntawm rau ntawm.
Qhov thib ob, yuav muaj dab tsi tshwm sim yog tias tsis muaj ib qho ntawm Ranvier? Nodes ntawm ranvier tso cai rau kev nqis tes ua kom sai sai mus rau hauv axon. Tsis muaj cov so ntawm myelin sheath, qhov muaj peev xwm ua yuav tsis taug kev sai li sai tau. Cov no node ntawm ranvier tso cai rau hluav taws xob ua nyob rau hauv lub xov tooj ntawm ib puag ncig thiab cov teeb liab hluav taws xob yuav raug nthuav tawm hauv axon.
Tsis tas li, cov nodes ntawm Ranvier ua dab tsi hauv lub paj hlwb?
Node ntawm Ranvier , periodic gap nyob rau hauv insulating sheath (myelin) ntawm lub axon ntawm tej yam cov neurons uas ua hauj lwm pab kom yooj yim conduction ntawm paj hlwb impulses.
Cov nodes ntawm Ranvier tsim tau li cas?
Nodal tsim Qhov kev txav ntawm lub axon no ua rau muaj txiaj ntsig zoo rau tag nrho tsim ntawm cov nodes ntawm Ranvier los ntawm kev tso cai heminodes tsim nyob rau ntawm ntug ntawm cov nyob sib ze glial hlwb kom fuse ua tiav nodes . Septate zoo li junctions daim ntawv ntawm paranodes nrog kev txhawb nqa NF155 hauv glial paranodal loops.
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