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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Nervous Tissue: Myelin01:25

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Neurons: The Axon01:21

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Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
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Mechanisms of Membrane Domain Formation00:59

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Neuron Structure01:30

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Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
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Related Experiment Video

Updated: Jul 21, 2025

Measuring Properties of the Membrane Periodic Skeleton of the Axon Initial Segment using 3D-Structured Illumination Microscopy 3D-SIM
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Membrane mechanics dictate axonal morphology and function.

Jacqueline M Griswold, Mayte Bonilla-Quintana, Renee Pepper

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    |July 28, 2023
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    Summary
    This summary is machine-generated.

    Unmyelinated axons exhibit a "pearling" morphology, not uniform tubes. Membrane mechanics, not just structure, govern axon shape and signal conduction speed.

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    Area of Science:

    • Neuroscience
    • Biophysics

    Background:

    • Axons are traditionally viewed as uniform cylinders for electrical signal conduction.
    • The precise morphology and its determinants in unmyelinated axons remain incompletely understood.

    Approach:

    • Utilized advanced imaging to reveal non-uniform axon structures with nanoscale boutons.
    • Developed computational models to link membrane biophysical properties (bending modulus, tension) to axon morphology.
    • Experimentally validated model predictions using various chemical and mechanical perturbations.

    Key Points:

    • Unmyelinated axons display a 'pearls-on-a-string' morphology with interspersed nanoscopic, non-synaptic boutons.
    • Axon pearling is explained by membrane mechanics, including bending modulus and tension.
    • Disrupting membrane mechanics via osmotic changes, cholesterol depletion, or myosin inhibition alters axon pearling.

    Conclusions:

    • Biophysical forces, specifically membrane mechanics, dictate unmyelinated axon morphology.
    • Neuronal activity modulates membrane cholesterol, affecting axon pearl size and slowing action potential conduction.
    • Membrane mechanics provide a novel mechanism for unmyelinated axon plasticity and function.