Primary Neurulation
Primary Neurulation - Related Videos
01:30
Neurulation
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2025
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 anterior...
08:14
Using Primary Neurosphere Cultures to Study Primary Cilia
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Cited by 3 •
2017
The primary cilium is fundamentally important in neural progenitor cell proliferation, neuronal differentiation, and adult neuronal function. Here, we describe a method to study ciliogenesis and the trafficking of signaling proteins to cilia in neural stem/progenitor cells and differentiated neurons using primary neurosphere cultures.
08:43
Primary Neuronal Cultures
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2023
The complexity of the brain often requires neuroscientists to use a simpler system for experimental manipulations and observations. One powerful approach is to generate a primary culture by dissecting nervous system tissue, dissociating it into single cells, and growing those cells in vitro. Primary cultures make neurons and glia easily accessible to the experimental tools required for techniques like genetic manipulation and time-lapse imaging. Furthermore, these cultures represent a highly...
01:28
Primary Distribution
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2024
Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.
01:06
Primary Production
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2025
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
FAQs
Closure proceeds through a coordinated shape change rather than a single event. Midline bending creates the neural groove, while the neural folds elevate and shift toward each other. Their subsequent fusion closes the tube, and the newly enclosed structure separates from the surface ectoderm. This sequence links tissue movement with structural compartment formation.
Neural fold elevation and convergence are important because they bring the two sides of the developing tissue into the position required for fusion. If closure does not occur correctly, the neural tube may not form normally. Studying these movements connects embryonic tissue behavior with developmental outcomes and clarifies how coordinated morphogenesis supports nervous system formation.
Primary neurulation has significance beyond physically closing the tube because it establishes the foundation for a patterned central nervous system. The coordination of bending, elevation, convergence, and fusion therefore matters for both shape and organization. A successful outcome is not merely a sealed structure, but an early framework for later brain and spinal cord development.
Investigators can organize observations around the sequence of visible morphogenetic changes: midline bending, neural-groove formation, neural-fold elevation, fold convergence, fusion, and separation from surface ectoderm. Tracking these linked stages provides a way to evaluate how the neural tube forms and where closure may be disrupted during embryonic development.
Within biology, this process is a model of embryonic morphogenesis, the shaping of tissues during development. It shows how coordinated movements can transform a neural plate into a closed, distinct structure. Consequently, primary neurulation provides a framework for relating tissue-level shape changes to the establishment of the vertebrate central nervous system.
Research on primary neurulation is especially relevant to neural tube defects because abnormal closure can alter formation of the brain and spinal cord precursors. Examining the closure sequence helps developmental biologists identify the stage at which normal morphogenesis fails. This connection makes the process useful for interpreting developmental disorders, not only for describing normal anatomy.