Myelinated nerves. Coloured scanning electron micrograph (SEM) of a freeze-fracture through peripheral nerves to show Schwann cells (green) and myelinated nerves (pink). A Schwann cell wraps its cell membrane around the nerve a number of times. In-between each cell membrane layer is a layer of myelin, an electrically insulating fatty layer. A Schwann cell effectively thickens a nerve's membrane and increases the speed at which nerve impulses are relayed. The Schwann cell's cytoplasm surrounds the axons (beige).
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TOP10219429
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達志影像
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RM
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