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Medical Definition of Sharpey's fiber. : any of the thready processes of the periosteum that penetrate the tissue of the superficial lamellae of bones.
View Full Document. 1  Sharpeyâs fibers: Fibers that secure the periosteum to the underlying bone (2) Endosteum: Covers the internal bone surfaces (a) Hematopoietic tissue: Red marrow (b) Found in the cavities of spongy bone 2.