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Videos de Conceptos Relacionados

Sensory Functions of the Skin01:16

Sensory Functions of the Skin

The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Cells of the Epidermis01:24

Cells of the Epidermis

The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...

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Updated: Jun 22, 2026

Intravital Two-Photon Imaging of Touch Sensory Axon Morphology in Mouse Skin
07:51

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Published on: December 30, 2025

Las células Merkel son esenciales para las respuestas al tacto ligero.

Stephen M Maricich1, Scott A Wellnitz, Aislyn M Nelson

  • 1Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA.

Science (New York, N.Y.)
|June 23, 2009
PubMed
Resumen

Las células Merkel son esenciales para detectar el tacto ligero. La eliminación de estas células en ratones eliminó las respuestas normales de los receptores táctiles, confirmando su papel crucial en el sistema somatosensorial.

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Last Updated: Jun 22, 2026

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Investigación del sistema sensorial somático de investigación del sistema sensorial somático.
  • Biología celular Biología celular.

Sus antecedentes:

  • El sistema nervioso periférico procesa la información somatosensorial como el tacto.
  • Los complejos neurita-célula de Merkel son conocidos como receptores táctiles, pero la función de las células de Merkel sigue siendo objeto de debate.
  • Comprender la contribución de las células Merkel a la sensación del tacto es crucial para la neurociencia.

Objetivo del estudio:

  • Investigar la necesidad de las células Merkel en las respuestas al tacto ligero.
  • Para determinar el papel preciso de las células Merkel dentro del sistema somatosensorial.

Principales métodos:

  • Utilizó la tecnología Cre-loxP para la supresión condicional del gen Atoh1 en la piel del ratón.
  • Generado Atoh1 ((CKO) ratones que carecen de células de Merkel en regiones específicas de la piel.
  • Se realizan preparaciones ex vivo de piel/nervio para analizar las respuestas neurofisiológicas.

Principales resultados:

  • Los ratones Atoh1 ((CKO) mostraron una ausencia completa de células Merkel en las áreas objetivo.
  • Las grabaciones neurofisiológicas de los preparados Atoh1 ((CKO) revelaron una pérdida de las respuestas del complejo neurita-célula Merkel.
  • Esto demuestra que las células Merkel son indispensables para codificar los estímulos táctiles.

Conclusiones:

  • Las células de Merkel son necesarias para el correcto funcionamiento de las respuestas de los receptores de Merkel.
  • Estos hallazgos confirman que las células Merkel son un componente esencial del sistema somatosensorial de los mamíferos.
  • El estudio resuelve un debate de larga data sobre la función de las células Merkel en la percepción táctil.