Video Experimental Relacionado
Updated: Jul 7, 2026
12:26
An Invasive Method for the Activation of the Mouse Dentate Gyrus by High-frequency Stimulation
Published on: June 2, 2018
Iniciación distal y propagación activa de los potenciales de acción en las dendritas de las interneuronas
1Physiologisches Institut der Universität Freiburg, Anatomisches Institut der Universität Freiburg, D-79104 Freiburg, Germany.
Science (New York, N.Y.)
|January 15, 2000
Resumen
Las conductancias activas en las dendritas de las interneuronas del hipocampo permiten una función confiable de la red neuronal. Estos hallazgos revelan cómo las dendritas contribuyen a la iniciación y propagación del potencial de acción, crucial para una actividad cerebral estable.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- La neurociencia computacional es una neurociencia computacional.
- La neurociencia celular es la neurociencia celular.
Sus antecedentes:
- La estabilidad de la red neuronal cortical depende de la activación rápida y confiable de las interneuronas inhibidoras.
- El papel de las conductancias activas en las dendritas de las interneuronas para la activación permaneció experimentalmente no verificado.
Objetivo del estudio:
- Investigar la presencia y la función de las conductancias activas en las dendritas de las interneuronas del hipocampo oriens-alveus.
- Para determinar el impacto de estas conductancias en la iniciación y propagación del potencial de acción.
Principales métodos:
- Utilizó grabaciones de pinzas de parche de las dendritas y somatas de las interneuronas del hipocampo oriens-alveus.
- Se aplicaron diferentes duradas de estímulo (largo o corto) para evaluar los sitios de iniciación potenciales de la acción.
Principales resultados:
- Se encontraron altas densidades de canales iónicos de sodio y potasio controlados por voltaje en las dendritas de las interneuronas.
- La iniciación del potencial de acción se produjo preferentemente en el axón con estímulos largos.
- Los estímulos breves desplazaron la iniciación del potencial de acción a sitios somatodendríticos.
- Los potenciales de acción se propagan de manera confiable a través del dominio somatodendrítico a alta velocidad, manteniendo la amplitud durante el disparo de alta frecuencia.
Conclusiones:
- Las dendritas de las interneuronas del hipocampo poseen conductancias activas que apoyan la iniciación y propagación confiables del potencial de acción.
- Estos hallazgos proporcionan evidencia experimental directa del papel funcional de las propiedades activas dendríticas en la excitabilidad de las interneuronas y la estabilidad de la red.
Videos de Conceptos Relacionados
02:47The 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.
01:14Action 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...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
01:14Action 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...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
01:28Action 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...
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...
01:23Propagation 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...
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...
01:28Neuronal Communication
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...