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Related Experiment Videos

Human dermal microvasculature: I. Its segmental differentiation. Light and electron microscopic study

J C Higgins, R A Eady

    The British Journal of Dermatology
    |February 1, 1981
    PubMed
    Summary

    Human skin microvasculature can be classified by detailed morphological analysis of endothelium and its investment, not just vessel diameter. This study identified transendothelial channels in capillary loops.

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    Area of Science:

    • Dermatology
    • Microcirculation Research
    • Histology

    Background:

    • Classifying human skin microvasculature is crucial for understanding dermal physiology and pathology.
    • Previous classification methods relied on vessel diameter, which is often unreliable due to fixation artifacts and overlap between segments.

    Purpose of the Study:

    • To establish reliable criteria for classifying the distinct segments of human dermal microvasculature.
    • To investigate the morphological characteristics of microvessels in the reticular and superficial dermis using advanced light and electron microscopy.

    Main Methods:

    • Light microscopic examination of 1 micrometer thick epoxy resin sections of human skin.
    • Correlative study using electron microscopy for precise delineation of vascular components.

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  • Detailed morphological analysis of endothelial characteristics, elastic laminae, and basal laminae.

    • Main Results:

    • Vessel diameter measurements showed significant overlap, limiting their value for classification.
    • Morphological characteristics of the endothelium and its investment proved superior for identifying vascular segments.
    • No arteriovenous shunts or precapillary sphincters were observed.
    • Closed fenestrae and potential transendothelial channels were frequently found at the tips of capillary loops near the epidermis.

    Conclusions:

    • Morphological assessment of the endothelium and associated structures is the preferred method for classifying human dermal microvessels.
    • Vessel density and arrangement vary regionally, but fundamental vessel structure remains consistent.
    • The presence of transendothelial channels in capillary loops warrants further investigation into their function.