Video: Qhov teeb meem grey nyob hauv lub hlwb nyob qhov twg?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Grey teeb meem hais txog cov neurons uas tsis tau sib cais thiab lwm lub hlwb ntawm lub hauv paus paj hlwb. Nws yog tam sim no nyob rau hauv lub hlwb , lub paj hlwb thiab cerebellum, thiab nthuav tawm thoob plaws hauv tus txha nqaj qaum.
Los ntawm qhov ntawd, qhov teeb meem grey pom nyob hauv lub hlwb li cas?
Dawb teeb meem yog pom faus rau hauv txheej txheej sab hauv lub hlwb cortex, thaum lub sij hawm qhov teeb meem feem ntau yog nyob ntawm qhov chaw ntawm lub hlwb . Tus txha nqaj qaum tau npaj nyob rau hauv txoj kev rov qab, nrog pom teeb meem grey sib sib zog nqus hauv nws cov tub ntxhais thiab cov insulating dawb teeb meem qhwv ncig sab nraud.
Ib yam li ntawd, yuav muaj dab tsi tshwm sim yog qhov teeb meem GRAY puas? Neuronal tuag yog lub plawv ntawm qhov teeb meem raug mob. Grey teeb meem yog li ntawd muaj kev raug mob hnyav heev thaum twg cov pa oxygen tsawg (hypoxia) xws li thaum muaj ischemic tshwm sim. Puas thiab tshwm sim thaum ib puag ncig hauv ib puag ncig hloov pauv xws li thaum muaj ntshav nkag los yog thaum twg lub cev kev puas tsuaj tshwm sim.
Dhau li, GRAY teeb meem thiab teeb meem dawb hauv lub hlwb yog dab tsi?
CNS muaj ob hom ntaub so ntswg: teeb meem grey thiab teeb meem dawb , Grey teeb meem , uas muaj pinkish- txho xim hauv lub neej lub hlwb , muaj lub cev ntawm tes, dendrites thiab axon terminals ntawm neurons, yog li nws yog qhov twg txhua qhov kev sib txuas yog. Qhov teeb meem dawb yog ua los ntawm axons txuas sib txuas sib txawv ntawm qhov teeb meem rau ib leeg
Dab tsi ua rau GRAY teeb meem hauv lub hlwb?
Lub cev ntawm tes tsuas yog ib feem ntawm qhov teeb meem . Nce hauv dendrite branching (qhov tau txais qhov kawg ntawm cov neurons) tuaj yeem nce qhov teeb meem grey , yam tsis xav tau cov neurons tshiab. Cov neurons uas twb muaj lawm ua kev sib txuas ntau ntxiv yuav ua rau siv tau ntau dua qhov teeb meem . Grey teeb meem yog neurons, lub cev ntawm tes, thiab tsawg heev axons.
Pom zoo:
Dab tsi muab cov xim grey ntawm cov teeb meem grey?
Hom roj hauv myelin ua rau nws zoo li dawb, yog li cov myelin-ntom dawb teeb meem siv rau ntawm cov xim dawb ib yam. Hauv kev sib piv, qhov teeb meem grey feem ntau yog lub cev neuron cell thiab tsis yog neuron hlwb hlwb hu ua glial cells. Cov kab mob glial no muab cov as -ham thiab lub zog rau cov neurons
Dab tsi yog pom nyob rau hauv cov teeb meem grey ntawm tus txha caj qaum?
Grey teeb meem hais txog unmyelinated neurons thiab lwm cov hlwb ntawm lub hauv nruab nrab lub paj hlwb. Nws muaj nyob rau hauv lub hlwb, lub paj hlwb thiab cerebellum, thiab tam sim no nyob rau hauv lub qaum qaum. Qhov teeb meem grey hauv tus txha nqaj qaum muaj interneurons, ntxiv rau lub cev ntawm tes ntawm cov paj hlwb
Lub paj hlwb nyob hauv lub hlwb nyob qhov twg?
Frontal lub cev
Qhov twg ntawm lub qhov muag muaj lub teeb pom kev uas hloov pauv lub teeb liab mus rau hauv kev xav ntawm lub paj hlwb?
Lub teeb yog mapped raws li ib tug duab nyob rau saum npoo ntawm lub retina los ntawm activating ib tug series ntawm lub teeb-sensitive hlwb hu ua rods thiab cones. Cov hlwb photoreceptor no hloov lub teeb mus rau hluav taws xob uas tau xa mus rau lub hlwb los ntawm cov hlab ntsha
Dab tsi yog qhov txawv ntawm grey teeb meem thiab cov teeb meem dawb?
CNS muaj ob hom ntaub so ntswg: grey teeb meem thiab dawb teeb meem, Grey teeb meem, uas muaj ib tug pinkish-grey xim nyob rau hauv lub hlwb nyob, muaj cov cell lub cev, dendrites thiab axon terminals ntawm neurons, yog li nws yog qhov twg tag nrho cov synapses. Qhov teeb meem dawb yog ua los ntawm axons txuas sib txawv ntawm qhov teeb meem grey rau ib leeg