Scanning Electron Microscopic Study on Collagen Fibrils in the Mink Dermis during the Hair Cycle and Growth

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  • SEMによるミンク真皮コラーゲン像の成長および毛周期に伴う変化
  • SEM ニ ヨル ミンク シンピ コラーゲンゾウ ノ セイチョウ オヨビ モウ

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Changes of the collagen fibrillar networks in mink dermis during the hair cycle and growths were studied by the use of the cell-maceration/scanning electron microscope method. In telogen, flat and felt-like structures of a collagen fibrillar network with small gentle undulations covered the dermal surface. In contrary during a anagen, the rough undulations constituted of collagen fibrillar bundles caused a discernible three dimensional effects on the dermal surface. In mink dermal cross-section during telogen the collagen fibrillar bundles were bundled tightly together, the inter-bundler space was minimal and the dermis was thin. However in anagen the collagen fibrillar bundles were in a looser arrangement so there was more interbundler space and a thicker dermis. The size of pore of hair (PH) increased during mink growth and were also larger in anagen than in telogen. The number of mink PH per unit area decreased with aging. The diameter of the individual collagen fibrils increased, and the density of collagen fibrillar bundles also increased during mink growth. Most collagen fibrils are arranged vertical to the body axis in mink dermis. The interstitial collagen fibrils of panniculus adiposus composed a felt-like structure. On the other hand, the collagen fibrils inside the connective tissue sheath of hair follicles were bundles running longitudinally parallel to the hair axis, and the collagen fibrils of the outer layer enclosed the inner layer and ran transversely against the hair

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