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A Demonstration of the Thickened Cellular Envelope of the Human Nail Cell With the Aid of Lanthanum Staining

Ken Hashimoto, MD

Arch Dermatol. 1971;103(4):387-393.

Abstract
The cellular envelope of the human toenail cell becomes twice as thick as the original cell membrane of the matrix cell. It was found that this thickened envelope, ie, the marginal band, was not formed by the coating of the original cell membrane by discharged contents of the membrane coating granules (MCGs). Instead, it was produced by the precipitation of proteinaceous material on the cytoplasmic side of the cell membrane. Keratohyaline granules do not seem to contribute to the formation of the marginal band, since the nail cells keratinized by accretion of tonofibrils without the formation of keratohyaline granules.

Author Affiliations
Memphis

From the Memphis Veterans Administration Hospital and the Section of Dermatology, Department of Medicine, University of Tennessee College of Medicine, Memphis. Dr. Hashimoto is awardee of medical investigatorship of the VA Career Development Program.

Footnotes
Accepted for publication Nov 2, 1970.

Reprint requests to Veterans Administration Hospital, 1030 Jefferson Ave, Memphis 38104.

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