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Videos de Conceptos Relacionados

Motor Units00:46

Motor Units

A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
Motor Units01:13

Motor Units

The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
Hierarchy of Motor Control01:18

Hierarchy of Motor Control

The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
Indirect Motor Pathways01:22

Indirect Motor Pathways

The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
Mechanical Systems01:22

Mechanical Systems

Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically described...
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...

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A Novel Single Animal Motor Function Tracking System Using Simple, Readily Available Software
08:22

A Novel Single Animal Motor Function Tracking System Using Simple, Readily Available Software

Published on: August 31, 2018

Un enfoque de pequeños sistemas para la generación de patrones de motor.

Michael P Nusbaum1, Mark P Beenhakker

  • 1Department of Neuroscience, University of Pennsylvania School of Medicine, Philadelphia 19104-6074, USA. msbaum@mail.med.upenn.edu

Nature
|May 17, 2002
PubMed
Resumen
Este resumen es generado por máquina.

La investigación en neurociencia explora cómo las redes neuronales crean movimientos coordinados. El sistema nervioso estomatogástrico de los crustáceos proporciona información clave sobre el funcionamiento del circuito motor rítmico a nivel celular.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • El control del motor es el control del motor.
  • Biología de los crustáceos Biología de los crustáceos

Sus antecedentes:

  • La comprensión de la generación de movimiento coordinado por redes neuronales es un objetivo central en la neurociencia.
  • El sistema nervioso estomatogástrico (STN) en los crustáceos decápodos ofrece un modelo valioso para estudiar los circuitos motores.
  • Este sistema comprende distintos circuitos motores que interactúan entre sí y que son cruciales para los movimientos rítmicos.

Objetivo del estudio:

  • Aclarar los principios del funcionamiento del circuito motor rítmico a nivel celular.
  • Para detallar la dinámica del circuito responsable de la generación de patrones de motor en el STN.
  • Investigar los efectos moduladores de los transmisores y neuronas individuales en la función de la STN.

Principales métodos:

  • Documentación detallada de la dinámica de los circuitos dentro del sistema nervioso estomatogástrico.
  • Análisis de los mecanismos de generación de patrones motores.
  • Investigación de la neuromodulación por transmisores y neuronas específicas.

Principales resultados:

  • La STN ha avanzado significativamente en la comprensión de la operación del circuito del motor rítmico a nivel celular.
  • La documentación detallada reveló la dinámica del circuito subyacente a la generación de patrones de motor.
  • Se caracterizó ampliamente la modulación por transmisores y neuronas individuales.

Conclusiones:

  • El sistema nervioso estomatogástrico es un poderoso modelo para comprender los principios fundamentales del control neuronal del movimiento.
  • El análisis a nivel celular de la STN proporciona información generalizable sobre la función del circuito motor.
  • La neuromodulación juega un papel crítico en la configuración de las salidas del motor rítmico.