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Videos de Conceptos Relacionados

Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Synaptic Signaling01:09

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
Synaptic Signaling01:12

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The Synapse02:47

The Synapse

Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.

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Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
08:08

Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond

Published on: June 24, 2015

Las entradas sinápticas sincronizadas localmente.

Naoya Takahashi1, Kazuo Kitamura, Naoki Matsuo

  • 1Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.

Science (New York, N.Y.)
|January 24, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Las neuronas forman grupos funcionales en las dendritas, recibiendo entradas sincronizadas. Esta organización ayuda en la compartimentación de la información e influye en cómo las neuronas procesan las señales, impactando la plasticidad sináptica y la integración.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Biología celular Biología celular.
  • La neurociencia computacional es una neurociencia computacional.

Sus antecedentes:

  • Las entradas sinápticas se someten a una conversión no lineal en potenciales de acción.
  • Los patrones espacio-temporales de activación dendrítica en la resolución de una sola sinapsis no se comprenden completamente.

Objetivo del estudio:

  • Para dilucidar los patrones espacio-temporales de la activación dendrítica en la resolución de una sola sinapsis.
  • Para investigar la organización funcional de las entradas sinápticas en las dendritas.

Principales métodos:

  • Imágenes ópticas de las actividades sinápticas de cientos de espinas dendríticas en las neuronas piramidal hipocampal y neocortical de roedores.
  • Enfoques experimentales in vivo y ex vivo.

Principales resultados:

  • Las espinas dendríticas adyacentes a menudo se sincronizan en redes espontáneamente activas.
  • Las espinas sincronizadas formaron "focos dendríticos" que recibieron entradas localmente convergentes de ensamblajes celulares presinápticos.
  • Esta organización sináptica agrupada se observó durante la remodelación del circuito dependiente del receptor de N-metil-D-aspartato.

Conclusiones:

  • La plasticidad sináptica agrupada está inherentemente programada para compartimentar las entradas correlacionadas a lo largo de las dendritas.
  • Los focos dendríticos pueden representar un mecanismo fundamental para la integración sináptica no lineal.
  • La geometría subcelular de las entradas sinápticas juega un papel crucial en la computación neuronal.