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Physiopathology of Lumboradicular Pain

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Abstract

Radicular nerves and nerve roots may be compared, for their function, to peripheral nerves. However, at least from the anatomic point of view, there are some differences between radicular and peripheral nerves. Both are formed by bundles of nerve fibers kept together by a framework of connective tissue. Each nerve fiber includes single axons ensheathed by longitudinal invaginations of Schwann cells. The largest nerve fibers are enwrapped in myelinic sheaths, constituted by multiple layers of Schwann cell cytoplasm around the axon. The myelinic sheath increases nerve conduction along the axon, prevents diffusion of spontaneous activity to the adjacent axons and guides the regenerative processes of nerve fibers after injuries. Moreover, the myelinic sheath regulates metabolic exchanges between the axon and Schwann cell (92). A basement membrane, formed by an internal glycoproteic layer and an external layer, the Key and Retzius sheath, lies adjacent to the Schwann sheath. The Key and Retzius sheath is closely connected to the endoneurium and is particularly thick in sensory nerve fibers (Ruffini’s sheath) (92).

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Cinotti, G., Postacchini, F. (1999). Physiopathology of Lumboradicular Pain. In: Lumbar Disc Herniation. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6430-3_6

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