x
uploads/axon.jpg

axon n.【動物;動物學】(神經細胞的)軸索。

axon reflex

Topics include : neural induction and pattern formation , cell lineage and fate determination , neuronal migration , axon guidance , synapse formation and stabilization , activity - dependent development and critical periods , development of behavior 主題包括:神經誘導和模式形成,細胞譜系和細胞命運確定,神經元遷移,軸突引導,突觸的形成和穩定性,依賴性活動的發育和危險期,行為的發育。

Kenyon cells are not labeled . in the back of the protocerebrum , there are two groups ( about 20 ) of large positive neurons whose axons often run in bundles , some thin branches of which invade a large area of the protocerebrum 在前腦后側,靠近蕈形體冠的下方,有對稱分布的兩組大的抗原細胞,在食道孔上方形成許多纖維束并且分枝向側前腦,前腦下方擴展,形成大量的陽性纖維。

This fact led me to speculate that an axon could find its retinal cell neighbors in the tectum by homing in on chemical scents released by active tectal neurons , because its neighbors were most likely at the source of this trail 這讓我懷疑,軸突是否可以藉著活躍的頂蓋神經元釋出的化學物質,找到頂蓋里的視網膜細胞鄰居,因為它的鄰居最有可能就在這條路的起點。

These cells are essential for neurons to communicate with one another because they insulate the long axons between neurons , preventing the electrical signal carried by the axons from dissipating 這些細胞會包圍在神經細胞的長軸突外,使它們彼此絕緣,如此可防止軸突所攜帶的電訊號消散開來,因此寡突細胞是神經細胞互相溝通所不可或缺的。

But how could the glia in our experiment be detecting the neuronal firing , given that the axons made no synaptic connections with the glia and the axonal glia were nowhere near the synapse 不過軸突并沒有突觸與神經膠細胞接觸,而且軸突上的神經膠細胞又離突觸那麼遠,我們實驗中的神經膠細胞如何才能夠偵測神經元的活性呢?

Heriditary neuropathies come in many shapes and sizes . charcot - marie - tooth type 2 ( cmt2 ) causes degeneration of peripheral sensory and motor neurons , particularly at the ends of these long axons 遺傳性神經病具有多種特點和方式。 2型腓骨肌萎縮癥( cmt 2 )導致外周特別是長軸突末端的感覺和運動神經元退化。

During development , it enters into the olfactory bulbs accompanying the growing olfactory axons , therefore , playing a supportive , neurotrophic and guidance role for the outgrowth of olfactory axons 在發育中,它伴隨生長的軸突進入嗅球,在嗅覺神經元軸突的生長中起支持,營養,導向等作用。

Results : in the group treated with scs and fn , the latency of p1 wave was significantly shorten and the number of regrowed axons significant increased , with a significant negative correlation 結果:雪旺細胞結合纖連蛋白治療組脊髓誘發電位潛伏期顯著縮短,再生軸突明顯增多,二者呈負相關。

Thus , a neuron can respond to inputs in only one way : it can either decide to send a signal on to the next neuron in the circuit by firing an impulse through its axon , or not 因此神經元對輸入的回應方式只有一種:它要嘛就產生沖動,讓訊號沿著軸突傳給下一個神經元,要嘛就什麼都不做。

Nogo - a was found in hippocampal neurons at different stages and is located in cytoplasm , membrane and neurites . nogo - a was detected at proximal part of all neurites before axon formation 結果提示nogo a在不同培養時間海馬神經元中均有表達,主要分布在胞漿、胞膜和突起上。

The authors expressed mutant mfn2 in cultured dorsal root ganglion neurons . fragmented mitochondria clustered in cell bodies and proximal axons of these neurons 作者在中培養背跟節神經元中進行mfn2突變表達。線粒體碎片在細胞內生長并聚集于最接近那些神經元軸突的地方。

Once the axon makes contact with the tectal neuron ' s dendritic arbor , a synapse forms between them and , voil , the two neurons that fire together are wired together 一旦軸突連上了頂蓋神經元的樹突分枝,就會在其間形成突觸,哇啦,同時激發的神經元就串連在一起了。

Then , nogo - a expression was gradually enriched in the distal segment and growth cone of the putative axon which grew much faster than other neurites 神經元突起形成過程中, nogo a主要表達于樹突近端,在軸突上隨著軸突的伸長逐漸表達于軸突遠端和生長錐。

The transport failure may result from reduced attachment of mitochondria to the microtubule transport apparatus , thus limiting deliery of energy supplies to long axons 傳輸失敗可能是由于微管傳輸系統的復合線粒體減少,因此限制了到遠端軸突的傳輸能量。

Neurotransmitters were not the answer ; they do not diffuse out of axons ( if they did , they could act in unintended places in the brain , wreaking havoc ) 神經傳遞物不會是答案,因為它無法從軸突擴散出去(否則就會作用到腦中其他非目標區,造成大災難) 。

Amazingly , by firing to communicate with other neurons , an axon could instruct the readout of genes in a glial cell and thus influence its behavior 令人驚奇的是,軸突藉著動作電位來與其他神經元溝通,而能夠指揮神經膠細胞的基因表現,進而影響其行為。

When a nerve cell in the vta is excited , it sends an electrical message racing along its axon ? the signal - carrying “ highway ” that extends into the nucleus accumbens Vta神經元興奮時就會送出電訊,沿著軸突這條伸入依核的傳訊高速公路快速傳送。

Thus , gpcrs can mediate both repulsive and attractive axon guidance in vitro , and chemokines may serve as guidance cues for axon pathfinding 因此, g蛋白耦聯受體可以介導生長錐的吸引或排斥反應,并且chemokine也能作為導向因子指導生長錐轉向。

A model of how glia around an axon sense neuronal activity and then communicate to other glia residing at the axon ' s synapse was coming together 有關圍繞軸突的神經膠細胞如何知道神經活性、然后告訴其他軸突突觸神經膠細胞的理論,在逐漸成形。