Myelinated retinal paj fibers (MRNF) yog cov paj hlwb retinal anterior mus rau lamina cribrosa uas, tsis zoo li cov paj hlwb ib txwm muaj, muaj myelin sheath. Clinically, lawv zoo li grey-dawb zoo-demarcated thaj ua rau thaj nrog frayed ciam teb ntawm lub anterior nto ntawm lub neurosensory retina.
Dab tsi yog myelination ntawm paj hlwb Fibers ua rau?
Nyob rau hauv xaus, myelinated retina paj fibers yog tsawg thiab tej zaum yuav txuam nrog ipsilateral myopia, amblyopia thiab strabismus. Qhov tseeb pathogenesis tseem tsis tau paub thiab qhov pom kev pom muaj kev tiv thaiv.
Kev ua haujlwm ntawm myelinated paj hlwb yog dab tsi?
Lub paj hlwb myelinated yog tsim los ntawm evolution rau muab lub cev nrog kev hloov pauv sai thiab muaj txiaj ntsig ntawm cov ntaub ntawv los ntawm peripheral receptors mus rau hauv nruab nrab paj hlwb (CNS), los ntawm CNS rau peripheral effectors, thiab nruab nrab ntawm cov chaw sib txawv hauv CNS.
Yuav ua li cas hauv cov hlab ntsha myelinated?
Myelin yog ib txheej insulating, los yog sheath uas tsim nyob ib ncig ntawm cov hlab ntsha, nrog rau cov nyob rau hauv lub hlwb thiab qaum qaum. Nws yog tsim los ntawm cov protein thiab fatty khoom. Qhov no myelin sheath tso cai rau hluav taws xob xa hluav taws xob xa mus sai thiab muaj txiaj ntsig raws cov paj hlwbYog tias myelin puas lawm, cov impulses qeeb.
Yuav ua li cas myelinated paj fibers xa impulses?
Feem ntau cov paj hlwb nyob ib puag ncig los ntawm cov ntaub thaiv npog, cov rog rog hu ua myelin, uas ua rau kom nrawm nrawm. Lub myelin sheath muaj lub sijhawm so hu ua nodes ntawm Ranvier. Los ntawm dhia ntawm node mus rau ntawm, lub zog tuaj yeem mus nrawm dua yog tias nws yuav tsum tau taug kev raws tag nrho qhov ntev ntawm cov hlab ntsha.
