Video: Dab tsi yog qhov txawv ntawm grey teeb meem thiab cov teeb meem dawb?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
CNS muaj ob hom ntaub so ntswg: grey teeb meem thiab dawb teeb meem , Grey teeb meem , uas muaj pinkish- grey xim nyob rau hauv lub hlwb nyob, muaj lub cev cell, dendrites thiab axon terminals ntawm neurons, yog li nws yog qhov twg txhua qhov synapses yog. Teeb meem dawb yog ua los ntawm axons txuas sib txuas sib txawv ntawm grey teeb meem rau ib leeg.
Ntxiv mus, qhov sib txawv ntawm teeb meem GRAY thiab teeb meem dawb yog dab tsi?
Grey teeb meem yog qhov txawv ntawm qhov teeb meem dawb nyob rau hauv uas nws muaj ntau lub cev ntawm tes thiab kuj muaj ob peb myelinated axons, thaum qhov teeb meem dawb muaj tsawg lub cev ntawm tes thiab yog tsim los ntawm cov kab ntev myelinated axons. Xim sib txawv tshwm sim feem ntau los ntawm qhov dawb ntawm myelin.
Ib sab saum toj no, qhov txawv ntawm qhov teeb meem grey thiab qhov teeb meem dawb quizlet yog dab tsi? Dab tsi yog qhov sib txawv ntawm teeb meem grey thiab teeb meem dawb . Grey teeb meem tsis muaj mylein sheath hla lub axon. Teeb meem dawb muaj myelin sheath npog. Nodes ntawm Ranvier yog qhov me me nruab nrab myelin hnab.
Ib yam li ntawd ib tug yuav nug, dab tsi yog lub luag hauj lwm ntawm grey teeb meem thiab dawb teeb meem?
Namely, lub grey teeb meem muaj glial hlwb, axon tracts, neuropil (glia, dendrites, thiab unmyelinated axons), nrog rau cov hlab ntsha capillary (1). Cov qhov teeb meem dawb muaj cov hlwb glial lub luag haujlwm rau kev tsim cov myelin (cov oligodendrocytes) thiab astrocytes (1).
Lub luag haujlwm dawb ntawm lub hlwb yog dab tsi?
Teeb meem dawb . Teeb meem dawb yog tsim los ntawm bundles, uas txuas ntau yam grey teeb meem cov cheeb tsam (qhov chaw nyob ntawm lub cev nqaij daim tawv) ntawm lub hlwb rau ib leeg, thiab nqa cov hlab ntsha impulses ntawm neurons.
Pom zoo:
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