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Electron microscopic studies of human tooth development
Author(s) -
Sisca Rodger F.,
Provenza D. Vincent
Publication year - 1970
Publication title -
journal of periodontal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.31
H-Index - 83
eISSN - 1600-0765
pISSN - 0022-3484
DOI - 10.1111/j.1600-0765.1970.tb00730.x
Subject(s) - hemidesmosome , organelle , ultrastructure , basal (medicine) , connective tissue , biology , electron microscope , glycogen , cell , epithelium , microbiology and biotechnology , anatomy , chemistry , biochemistry , endocrinology , genetics , physics , insulin , optics
This study present an ultrastructural characterization of the prospective gingival epithelium in the human embryo during the third and fourth months of development. The surface cells were squamoid and interdigitated. The central cell layer was composed of more rounded cells while those of the basal layer were cuboidal to low columnar. The intercellular spaces were fewer and smaller toward the free surface. Differences in the number, variety and organizational aspects of the junctional complexes were noted relative to level of location. Hemidesmosomes were observed at the basal cell‐connective tissue interface. Pronounced differences in the kinds and number of organelles were noted at the various epithelial levels. In the surface cells, glycogen was accumulated throughout the cell and organelles were reduced in number. As the glycogen diminished in the cells toward the basal region, the organelle complement increased. The arrangement of tonofilaments tended to change toward the superficial layers. The larger masses were located in the deeper and central cells while surfaceward, tonofilaments were diffusely distributed.