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Videos de Conceptos Relacionados

The Neuromuscular Junction01:19

The Neuromuscular Junction

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Spinal Cord: Information Processing01:10

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The spinal cord is an integral hub for motor and sensory information that enables the brain to communicate with the peripheral nervous system (PNS). This communication consists of relaying sensory data and transmission of motor commands.
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Neuromuscular Junction And Blockade01:29

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Generation of Action Potential in Skeletal Muscles01:24

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Functions of the Nervous System01:18

Functions of the Nervous System

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The nervous system is responsible for coordinating and regulating the body's functions. It functions through three main processes: sensory, integrative, and motor processes. Sensory function involves the detection and transmission of information about internal and external stimuli from sensory receptors to the CNS. The CNS processes this information through an integrative function, where it interprets and makes decisions based on the incoming sensory information. Finally, the motor function...
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Video Experimental Relacionado

Updated: Sep 10, 2025

Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
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Información neuronal distinta compartida en el músculo espástico a través de la decodificación de la actividad

Tian Xie, Chuyao Jian, Yujian Lei

    IEEE transactions on bio-medical engineering
    |August 26, 2025
    PubMed
    Resumen

    Después de un accidente cerebrovascular, las neuronas motoras espinales procesan la información neuronal involuntaria y voluntaria de manera diferente. La actividad refleja depende más de las propiedades de la médula espinal que de la entrada del cerebro, lo que indica un flujo de información desequilibrado.

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    Área de la Ciencia:

    • La neurociencia
    • Control del motor
    • Ciencias de la rehabilitación

    Sus antecedentes:

    • El accidente cerebrovascular puede alterar las vías neuronales que controlan los movimientos voluntarios e involuntarios.
    • Comprender cómo las motoneuronas espinales procesan la información neural después del accidente cerebrovascular es crucial para la rehabilitación.
    • Las investigaciones anteriores no han aclarado completamente las diferencias en el procesamiento de la información neuronal durante la activación involuntaria frente a la voluntaria en los sobrevivientes de accidente cerebrovascular.

    Objetivo del estudio:

    • Investigar si las motoneuronas espinales reciben y transmiten información neuronal idéntica durante la activación muscular involuntaria y voluntaria después de un accidente cerebrovascular.
    • Comparar la actividad de la unidad motora (UM) y la entrada sináptica común (ICC) entre las contracciones involuntarias y voluntarias en sobrevivientes de ACV.

    Principales métodos:

    • La electromiografía superficial de alta densidad (HD-sEMG) registró la actividad del músculo bíceps braquial en 14 sobrevivientes de accidente cerebrovascular y 10 controles.
    • Se realizaron tareas de estiramiento pasivo (involuntario) y de contracción activa (voluntario).
    • La velocidad de descarga de la unidad motora (MU), la variabilidad y la distribución del potencial de acción de la unidad motora (MUAP) se analizaron utilizando algoritmos de descomposición.
    • El análisis de correlación cruzada cuantificó la entrada sináptica común (CSI) a las motoneuronas.

    Principales resultados:

    • En los sobrevivientes de accidente cerebrovascular, la activación involuntaria mostró una mayor tasa de descarga de MU y una menor variabilidad de descarga en comparación con la activación voluntaria.
    • Se observaron patrones distintos de distribución del potencial de acción de la unidad motora (MUAP) entre las activaciones involuntarias y voluntarias.
    • La entrada sináptica común (ICC) fue menor durante la activación involuntaria que durante la activación voluntaria, y la variabilidad de la descarga se correlacionó positivamente con la ICC.

    Conclusiones:

    • El procesamiento de información neuronal por las motoneuronas espinales difiere significativamente entre la activación muscular involuntaria y voluntaria después del accidente cerebrovascular.
    • Los hallazgos sugieren un flujo de información desequilibrado entre los centros supraspinarios y la médula espinal después del accidente cerebrovascular.
    • La descarga de la unidad motora durante la actividad refleja parece estar más influenciada por las propiedades intrínsecas de las motoneuronas espinales que por las órdenes cerebrales descendentes.