title: Sheathing of collagen fibrils in human intervertebral discs.
abstract: In 25 human intervertebral discs studied by electron microscopy, sheathing collagen-like fibrils by electron-dense cylinders was observed. The sheaths consisted of layers of dense granules 3 to 12 times the diameter of the enclosed collagen-like fibrils, and they appeared to be more frequent in older discs.
mesh_terms: D000328:Adult; D000368:Aged; D003094:Collagen; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007403:Intervertebral Disc / Q000648:ultrastructure*; D007405:Intervertebral Disc Displacement / Q000473:pathology; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged
chemical_list: D003094:Collagen