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Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Sequential organogenesis sets two parallel sensory lines in medaka.

Ali Seleit1,2, Isabel Krämer1,2, Elizabeth Ambrosio1

  • 1Animal Physiology and Development, Centre for Organismal Studies (COS) Heidelberg, Im Neuenheimer Feld 230, Heidelberg 69120, Germany.

Development (Cambridge, England)
|January 15, 2017
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Summary

Medaka embryos form sensory neuromast organs using two distinct developmental programs, ensuring a fixed ratio between ventral and midline sensory lines. This self-organizing system relies on specific chemokine receptor genes for proper organ distribution.

Keywords:
Cxcr4bCxcr7Eya1Lateral lineNeuromastOrganogenesis

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Genetics

Background:

  • Animal organ formation typically follows a single developmental program during embryogenesis.
  • The lateral line system in fish serves crucial sensory functions.

Purpose of the Study:

  • To investigate the developmental mechanisms underlying neuromast organ formation in medaka embryos.
  • To understand how distinct cellular migration strategies contribute to sensory organ patterning.

Main Methods:

  • Comparative analysis of ventral and midline neuromast formation in medaka embryos.
  • Investigation of the role of chemokine receptor genes (cxcr4b, cxcr7b) in neuromast development.
  • Observation of cell migration patterns during lateral line system development.

Main Results:

  • Neuromast organs are generated by two distinct, sequential developmental programs.
  • Ventral posterior lateral line (pLL) neuromasts form from collectively migrating cells, while midline pLL neuromasts arise from individually migrating cells.
  • The formation of both ventral and midline neuromasts is dependent on cxcr4b and cxcr7b chemokine receptor genes, maintaining an invariable ratio between them.

Conclusions:

  • The lateral line system exhibits self-organizing properties to ensure consistent sensory organ distribution.
  • Distinct morphogenetic processes can be mediated by common molecular players like cxcr4b and cxcr7b.
  • Sequential developmental programs contribute to the precise patterning of sensory organs in vertebrate embryogenesis.