Myelin Sheath

Description

Concentric lamellae of myelin wrap tightly around a central axon, forming a cylindrical internode consistent with a Schwann cell segment in the peripheral nervous system. One segment appears intact with smooth, continuous layering, while the other is disrupted mid-portion, exposing the inner axonal core and the stratified myelin layers at the torn margin. The axon occupies the central axis, with myelin forming the outer, circumferential insulation in a proximal to distal orientation along the fiber. Damage is the point. That contrast between preserved and disrupted wrapping matters when you teach saltatory conduction and what fails in demyelinating disease. Conduction velocity depends on intact internodal myelin and nodal architecture; tearing or loss of lamellae increases current leak and can produce conduction block, the electrophysiologic pattern clinicians see in peripheral neuropathies and in segmental demyelination. The stylized “rolled” geometry also maps cleanly to how myelin is formed, repeated Schwann cell membrane spirals compacted into lipid-rich layers around the axolemma. Use this artwork in neuroanatomy and histology courses to bridge the jump from electron micrographs to an intuitive 3D model of the myelin sheath, or in neurology teaching decks that explain demyelination, remyelination, and why internode length and myelin thickness shift conduction speed. It also fits patient education materials and editorial figures covering disorders such as Guillain-Barre syndrome, Charcot-Marie-Tooth disease, or focal nerve compression where myelin injury precedes axonal loss. Anatomical accuracy verified by SciePro's Medical Advisory Board.