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Neural Circuits

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...

Hierarchy of Motor Control

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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.

Motor Units

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Motor Units

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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.
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Enteric Nervous System: Regulation of GI Motor Activity

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The Enteric Nervous System (ENS) plays a pivotal role in regulating gastrointestinal or GI motor activity. This complex network of nerves, deeply embedded within the gut wall, responds to changes in the gut environment and receives input from both the autonomic nervous system and the central nervous system. By doing so, the ENS operates various programs tailored to the body's nutritional status and needs.
During periods of fasting, the ENS initiates the migrating myoelectric complex, a...

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Spinal Cord Electrophysiology

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Published on: January 18, 2010

La diversidad de las interneuronas inhibidoras espinales delinea los microcircuitos motores variantes

Jay B Bikoff¹, Mariano I Gabitto¹, Andre F Rivard²

¹Howard Hughes Medical Institute, Columbia University, New York, NY 10032, USA; Kavli Institute for Brain Science, Columbia University, New York, NY 10032, USA; Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY 10032, USA; Departments of Neuroscience and Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA.

|March 8, 2016

Resumen

Las interneuronas de la médula espinal, cruciales para el movimiento, son diversas. Los investigadores identificaron distintos subconjuntos de interneuronas V1 basados en la expresión génica, revelando una variada organización de microcircuitos para diferentes músculos de las extremidades.

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Área de la Ciencia:

La neurociencia
Control del motor
Biología celular

Sus antecedentes:

Los circuitos espinales controlan el movimiento del animal a través de la activación muscular precisa.
Las interneuronas locales son clave para estos circuitos, pero su diversidad y organización no se comprenden completamente.

Objetivo del estudio:

Investigar la diversidad y la lógica organizativa de las interneuronas V1, una población inhibidora importante en el control motor.
Determinar si los subconjuntos de interneuronas V1 tienen propiedades y distribuciones espaciales distintas.

Principales métodos:

Análisis de la expresión del factor de transcripción en las interneuronas V1.
Caracterización de las propiedades fisiológicas y distribuciones espaciales de los subconjuntos de interneuronas V1 identificados.

Principales resultados:

Las interneuronas V1 se fraccionan en diversos subconjuntos basados en 19 factores de transcripción.
Estos subconjuntos definidos por transcripción muestran firmas fisiológicas distintas y sesgos espaciales (mediolaterales, dorsoventrales).
Las diferencias de posición influyen en la entrada de las neuronas sensoriales y motoras, lo que sugiere que la posición dicta la organización del microcircuito.

Conclusiones:

La posición de la interneurona es un determinante crítico de la organización del microcircuito espinal.
La diversidad de las interneuronas V1 implica arquitecturas de microcircuitos inhibidores variables para diferentes grupos musculares de las extremidades (cadera, tobillo, pie).
Esto revela un diseño de circuito flexible para controlar el movimiento de las extremidades.