Nervous / VISUAL EXPLAINER
Does One Myelin-Making Cell Wrap One Axon or Several?
A myelinating Schwann cell supplies one peripheral internode on one axon. An oligodendrocyte can supply several central internodes; the axons remain continuous beneath and between glial membrane sheaths.
READ THE IMAGE
What the illustration shows
English educational poster comparing myelin cell territories. Left, one teal Schwann cell wraps a segment of a continuous orange axon; its nucleus sits in outer cytoplasm. Right, one purple oligodendrocyte sends three processes to separate myelin segments on three continuous orange axons. A lower cutaway shows concentric membrane around an intact axon. Text distinguishes one peripheral internode from several central internodes and says the axon remains continuous. Simplified, not to scale. Gold AllHumanBody.com and full slogan appear below.
How to interpret this poster
- Only myelinating Schwann cells are compared; non-myelinating Schwann cells may associate with multiple axons.
- Three central branches are an example, not a fixed limit; layers and distances are not ultrastructural measurements.
- No one-cell-whole-neuron, all-CNS-axons-myelinated, conduction-speed, disease or regeneration claim.
- AI-assisted educational illustration; not physician certification, microscopy, a diagnosis or individualized medical advice.
- Fine annotations need enlargement; the full description provides an accessible text alternative.
- Display the full uncropped illustration; do not trim titles, legends or boundary annotations.
AI-assisted educational illustration, adapted into web-sized images without changing its composition. This is general education, not an individual diagnosis or treatment recommendation.
EVIDENCE / CONTEXT
Sources and what they support
- Anatomy and Physiology 2e: 12.2 Nervous Tissue ↗
Myelinating-cell territories and glial membrane wrapping; preserved direct myelination lines 101–113 and production reread.