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Videos de Conceptos Relacionados

Action Potentials01:41

Action Potentials

Overview
Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...

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Spinal Cord Electrophysiology II: Extracellular Suction Electrode Fabrication
08:47

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Published on: February 21, 2011

Actividad eléctrica en el desarrollo neuronal temprano.

Nicholas C Spitzer1

  • 1Neurobiology Section, Division of Biological Sciences and Centre for Molecular Genetics, Kavli Institute for Brain and Mind, University of California San Diego, La Jolla, California 92093-0357, USA. nspitzer@ucsd.edu

Nature
|December 8, 2006
PubMed
Resumen
Este resumen es generado por máquina.

El desarrollo del cerebro, que una vez se pensó que era puramente genético, ahora se entiende que involucra fuertemente la actividad eléctrica. Esta actividad es crucial en todas las etapas del desarrollo del sistema nervioso, asociándose con programas genéticos.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Biología del desarrollo Biología del desarrollo.

Sus antecedentes:

  • Históricamente, el desarrollo del cerebro se consideraba independiente de la actividad eléctrica.
  • La proliferación neuronal, la migración y la diferenciación se atribuyeron únicamente a programas genéticos, con una actividad importante solo para el refinamiento posterior de las conexiones.

Objetivo del estudio:

  • Investigar el papel de la actividad eléctrica en el desarrollo temprano del sistema nervioso.
  • Explorar las reglas generales del desarrollo dependiente de la actividad en diferentes etapas.

Principales métodos:

  • Revisión de los hallazgos recientes sobre el desarrollo neuronal.
  • Análisis del papel de la actividad neuronal en la neurogénesis embrionaria y adulta.

Principales resultados:

  • Descubrimientos recientes indican roles esenciales para la actividad eléctrica en el desarrollo temprano del sistema nervioso.
  • La actividad eléctrica juega un papel similar en la incorporación de nuevas neuronas en el sistema nervioso adulto.

Conclusiones:

  • La actividad eléctrica no es solo para refinar las conexiones, sino que es parte integral de la construcción temprana del cerebro.
  • El desarrollo dependiente de la actividad sugiere una asociación continua entre la actividad eléctrica y los programas genéticos a lo largo de todas las etapas de desarrollo.