![]() groups previously defined on the basis of morphological w x criteria by using. Sensenbrenner, M., Devilliers, G., Bock, E. e Deep short-axon cell with varicose dendrite in the GCL. c: Varicose-rich distal dendrites define an annulus within the dendritic field, characteristic of starburst amacrine cells in other species, even in cells. Dendrites also refer to the branching projections from the. Prochiantz, A., Delacourte, A., Daguet, M.-C. Biology definition: A dendrite is any of the protoplasmic protrusions (2 m long and usually 5 7 in number) that radiate from the neuronal cell and function to receive the electrochemical signals at the axonal synapse and further propagate them to the neuronal cell body or soma. ![]() The mechanisms regulating how frequently synapses. Nature 288, 370–373 (1980).ĭenis-Donini, S., Glowinski, J. Along unmyelinated central axons, synapses occur at focal swellings called axonal varicosities (boutons). Prochiantz, A., di Porzio, U., Kato, A., Berger, B. ![]() These results demonstrate that glial cells from two different brain regions have distinct properties which could be used to define neuronal polarity observed in vivo.īray, D. There were 25 primary dendrites and sparsely branched dendrites with varicosities. You may also have pain, swelling, heaviness, and achiness over or. varicose Meaning, pronunciation, translations and examples. On mesencephalic glial cells the majority of DA neurones develop a great number of highly branched and varicose neuntes, whereas on striatal glia they only exhibit one long, thin and rather linear neurite. The primary symptoms of varicose veins are highly visible, misshapen veins, usually on your legs. Dopaminergic neurones from the mesencephalon were plated on glial monolayers prepared either from the striatal or the mesencephalic region of the embryonic brain. Using a similar approach in which the morphology of individual DA cells can be studied after 3H-DA uptake and autoradiography, we now report on in vitro neurone-glia interactions and show that glial cells exert a morphogenetic effect on DA neurones. We have previously shown that striatal target neurones influence the biochemical maturation of ascending mesencephalic dopamine (DA) cells in culture 6,7, as well as the elongation rate of DA neuntes 8. The shape of a neurone-the projection and branching pattern of axons and dendrites-appears to be determined by a combination of intrinisic and environmental influences 1–5.
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