Periostun dış fibroz tabakasından matrix içine giren kollajen fibril demetlerine denir. Bu lifler sayesinde periost kemiğe yapışır.

A, crown of the tooth, covered by enamel
B, root of the tooth, covered by cementum
C, alveolar bone
D, subepithelial connective tissue
E, oral epithelium
F, free gingival margin
H, principle gingival fibres (!)
I, alveolar crest fibres of the periodontal ligament (PDL)
J, horizontal fibres of the PDL
K, oblique fibres of the PDL

Wikipedia: Sharpey%27s_fibres