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Videos de Conceptos Relacionados

Glial Cells01:04

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Overview
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Neurons: The Cell Body and the Dendrites01:23

Neurons: The Cell Body and the Dendrites

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A typical nerve cell comprises three main components: the cell body, dendrites, and the axon. The cell body, also known as the soma or perikaryon, serves as the central biosynthetic hub housing a nucleus surrounded by cytoplasm containing organelles commonly found in most cells. Notably, Nissl bodies, clusters of the rough endoplasmic reticulum and free ribosomes responsible for protein synthesis, are distinctive features of the neuronal cell body. As neurons age, aggregates of a brown pigment...
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Nervous Tissue: Neuron Types01:19

Nervous Tissue: Neuron Types

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Neurons, the fundamental units of the nervous system, can be classified based on both their structural and functional characteristics.
Structurally, neurons are categorized into three main types: multipolar, bipolar, and unipolar (or pseudounipolar). Multipolar neurons, which are the most common type in the brain and spinal cord, as well as all motor neurons, possess multiple dendrites and a single axon.
Bipolar neurons, on the other hand, have one primary dendrite and one axon. They are...
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Neurogenesis and Regeneration of Nervous Tissue01:15

Neurogenesis and Regeneration of Nervous Tissue

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Nervous Tissue: Glial Cells01:31

Nervous Tissue: Glial Cells

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Glia, or neuroglia, are vital support cells that assist neurons in their functions. The term "glia" originates from the Greek word for "glue," reflecting their role in holding the nervous system together. These cells can be categorized into six types: four in the central nervous system (CNS) and two in the peripheral nervous system (PNS).
The CNS glial cell includes the astrocytes, the oligodendrocytes, the microglia, and the ependymal cells.
Astrocytes are star-shaped glial...
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Neurons as Communicators of the Brain01:22

Neurons as Communicators of the Brain

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Neurons, the fundamental units of the brain and nervous system, function as the primary transmitters of information throughout the body. Their ability to communicate through electrical and chemical signals is vital for every bodily function, from regulating the heartbeat to processing complex thoughts. Each neuron has three main components: the cell body (soma), dendrites, and an axon, each specialized to facilitate swift and efficient neural communication.
Cell Body
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Video Experimental Relacionado

Updated: May 4, 2026

Three-dimensional Tissue Engineered Aligned Astrocyte Networks to Recapitulate Developmental Mechanisms and Facilitate Nervous System Regeneration
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El desarrollo de células madre neurales.

S Temple1

  • 1Center for Neuropharmacology and Neurosciences, Albany Medical College, Albany, New York 12208, USA. temples@mail.amc.edu

Nature
|November 2, 2001
PubMed
Resumen

La plasticidad de las células madre neurales ofrece un potencial de reparación, pero los estudios de desarrollo sugieren tipos celulares restringidos. Reconciliar estos puntos de vista es clave para la investigación de la regeneración del sistema nervioso.

Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Biología del desarrollo Biología del desarrollo.
  • Investigación con células madre.

Sus antecedentes:

  • La plasticidad de las células madre adultas sugiere un progenitor universal para la reparación del tejido neural.
  • Esto contrasta con los estudios de desarrollo que indican restricciones de células madre específicas de la región y el tiempo.

Objetivo del estudio:

  • Para conciliar los puntos de vista aparentemente contradictorios sobre la plasticidad de las células madre y las restricciones del desarrollo.
  • Aclarar el potencial y las limitaciones de las células madre para la reparación del sistema nervioso.

Principales métodos:

  • Revisión de la literatura existente sobre la plasticidad de las células madre adultas.
  • Análisis de los hallazgos de los estudios de células madre del desarrollo.

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  • Análisis comparativo del comportamiento de las células madre en diferentes contextos.

    • Principales resultados:

    • La evidencia apoya tanto una amplia plasticidad como un potencial restringido dependiendo de la fuente y el contexto de la célula madre.
    • El tiempo de desarrollo y la ubicación anatómica influyen significativamente en el destino de las células madre.
    • Un modelo unificado puede requerir el reconocimiento de distintas poblaciones de células madre y sus nichos específicos.

    Conclusiones:

    • El potencial de las células madre para la reparación neuronal no es uniforme; está limitado por los orígenes y el tiempo de desarrollo.
    • Comprender estas restricciones es crucial para desarrollar terapias regenerativas efectivas para el sistema nervioso.