Zusammenfassung
Die Zellmembran und der von ihr abgegrenzte Innenraum der Zelle sind die Träger der Aktionsund elektrotonischen Potentiale. Die außerhalb der Zelle während dieser Potentialänderungen fließenden Ströme haben geringe Dichte (Abb. 4–18), und außerhalb der Zelle, nahe der Membran gemessene Potentialänderungen während eines Aktionspotentials erreichen kaum 100 µ.V Amplitude. Diese geringen Potentialänderungen oder Ströme können benachbarte Zellen in der Regel nicht beeinflussen. Das Nervensystem ist jedoch ein Netzwerk von Neuronen, deren Hauptaufgabe der Austausch von Informationen ist. Der Informationsträger ist das Aktionspotential, und für kurze Entfernungen sind es auch elektrotonische Potentialänderungen. Diese Potentialänderungen können an spezialisierten Membrankontakten von zwei Zellen, elektrischen Synapsen, mit einer gewissen Schwächung von Zelle zu Zelle weitergegeben werden.An einem zweiten Typ von Zell-Zell-Kontakten, den chemischen Synapsen, wird die Potentialänderung der präsynaptischen Zelle in die Ausschüttung eines chemischen Signalstoffes, eines Überträgerstoffes oder Transmitters umgesetzt.
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Dudel, J. (2001). Synaptische Erregung und Hemmung. In: Dudel, J., Menzel, R., Schmidt, R.F. (eds) Neurowissenschaft. Springer-Lehrbuch. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56497-0_5
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