The endoneurium is a layer of delicate connective tissue that encloses the myelin sheath of a nerve fiber within a funiculus.^[1]

It is continuous with septa which pass inward from the innermost layer of the perineurium, and shows a ground substance in which are imbedded fine bundles of fibrous connective tissue, primarily collagen, running for the most part longitudinally.

It serves to support capillary vessels, arranged so as to form a net-work with elongated meshes.

It is found in other places too, such as surrounding the Schwann cells on the peripheral side of the transitional zone on the auditory nerve.^[2]

References

External links

• - "Ultrastructure of the Cell: myelinated axon and Schwann cell"
• - "Ultrastructure of the Cell: arteriole and peripheral nerve"
• at University of California, Los Angeles
• at Howard University

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