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Is it possible to distinguish parts of toenail from skin, for example under a microscope?

Say I had a hypothesis that some toenail material had wound its way down the toe and spread out under the sole of the foot. Would it be possible to examine the material and definitively eliminate a possible origin in the toenail matrix or surrounding tissue? Which medical or lab professionals would be qualified for this analysis?

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  • You got a good answer before I encountered your question so I'm going to leave it open, but in the future you need to observe our requirements for prior research. Please see this post and also How to Ask. We require some degree of prior research when asking questions. This question would normally be closed for lack thereof.
    – Carey Gregory
    Dec 12, 2021 at 5:19

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The branch that studies the different structures at microscopic level is Histology and histopathology (in case you study tissue for abnormalities). In histopathology you apply different preparation and staining techniques and try to study the tissue under the microscope and figure out if the tissue is normal or has some abnormality in it or even study if the tissue belongs to the organ which was biopsied, that's how for example metastatic cancers are figured out.

The specialty in medicine that studies tissues is "Pathological anatomy" and the doctors who are specialized are called pathologists, it generally involves less interaction with patients but has a wide opportunity for research. Also a dermatologist (not all) could be well formed in skin histology and could observe skin biopsies and decide what tissues are found but generally the biopsies are sent to the pathologist, also a biologist could specialize in studying body tissues. There are also histotechnicians and Histotechnologists (more specialized than histotechnicians) who studied how different tissues are prepared for studying and how to apply sophisticated techniques of preparation for the biopsies for the pathologist to study them, they are an integral part of the laboratory. Generally the pathologist is the authority in the hospital on the characteristics of the biopsies (all tissues not only skin) and gives the final word.

As for toenail histology, you can differentiate completely a nail plate from the skin as it will be completely formed of cornified dead epidermal keratinocytes without the other layers of skin cells. (Cornified cells is found also on the outer layer of skin but it will be much less thick than the nail plate and the other normal skin layers will be found). The nail bed is formed of skin cells but there are only 3 layers and lacks the other layers found in normal ski. The matrix is also formed of a specific skin cells layers and lacks the granular layer normally found in the skin. This article is very excellent in explaining the different characteristics of each constituent of the nails and how they differ from the normal skin. https://www.actasdermo.org/en-nail-histopathology-articulo-S1578219013001443

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    That was very helpful indeed. It answered the question, and pre-empted correctly a bunch of other questions I would have had diffficulty forming correctly.
    – ToMath
    Dec 11, 2021 at 22:35

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