Sharpey's fibres (bone fibres, or perforating fibres) are a matrix of connective tissue consisting of bundles of strong collagenous fibres connecting periosteum to bone. They are part of the outer fibrous layer of periosteum, entering into the outer circumferential and interstitial lamellae of bone tissue.
In the teeth, Sharpey's fibres are the ends of principal fibres that insert into the cementum. A study on rats suggests that the three-dimensional structure of Sharpey's fibres intensifies the continuity between the periodontal ligament fibre and the alveolar bone (tooth socket), and acts as a buffer medium against stress. 
In the skull the main function of Sharpey's fibres is to bind the cranial bones in a firm but moveable manner; they are most numerous in areas where the bones are subjected to the greatest forces of separation.  Each fibre is accompanied by an arteriole and one or more nerve fibres.
English anatomist William Sharpey described them in 1846.
Kuroiwa, M (1994). "Electron microscopic studies on Sharpey's fibers in the alveolar bone of rat molars". Kaibogaku Zasshi. 69 (6): 776–82. PMID 7887126. Unknown parameter
Retzlaff, EW (1982-3). "Efficacy of Cranial Sacral Manipulation: The Physiological Mechanism of the Cranial Sutures". J Soc. Osteopaths (12). ISSN 0308-8766. Unknown parameter
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