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How can scar tissue form if your skin is cut deeply?

  1. Mar 30, 2010 #1

    If your skin is cut deeply, meaning a cut to dermis why is that we can see scar tissue. I mean if the cut region in the dermis would be replace by scar tissue, but the epidermis region above that would have normal epithelial cell because they can divide easily. So if the epidermis grows back normally how can we see scar tissue? Thanks :smile:
  2. jcsd
  3. Mar 30, 2010 #2
    Is your question asking why if we get a injury down to the dermis does the epidermis not grow over the scar tissue preventing it from being visible?
  4. Mar 30, 2010 #3
    Fibroblasts are everywhere.
    Last edited by a moderator: Apr 24, 2017
  5. Mar 30, 2010 #4
    Yes I'm thinking that no matter what the injury is the epidermis would heal normally. If there is a deep cut is the epidermis also covered with fibroblasts as the post above says. :smile:
  6. Mar 30, 2010 #5
    Cuts such as shown heal from the bottom up .. First, there's blood, then blood clotting, forming a 'network' of bridging fibers/fibrils, and in this 'scaffolding' fibroblasts will be 'activated'. They will arrange themselves to be perpendicular to the planes of the cut surfaces.
    Fibroblasts, as the gather and are activated will then do a thing much like a muscle cell: it will begin to contract its length, pulling the opposite sides of the incision/cut together, from the bottom up.

    It is the fibroblasts and collagen that make up the resulting scar; but
    it doesnt stop there: Over time, the fibroblasts will continue to pull more and more, being at least one force that tends to make scars become thinner and thinner. Enzymes are also at work, removing tissue. Whiteblood cells are very active inititallly there, fighting infection, which will *always* happen, at least to some insignificant degree, if the person's immune system is functioning well.

    Scars sometimes do the opposite: such a person who has that contrary sort of growth of the scan (ie, a 'keloid' former) sometimes can have huge scar formations requiring surgery (which of course might make more scar!) or the application of a kind of 'pressure dressing' over the scar , the dressing being made of a silicone material. These can reduce the size of a scar over time. Such dressings are available in just about any pharmacy (eg, CVS, etc).

    The epidermis consists of several laybers of cells, the outermost being dead cells. These are exfoliated , just as is their normal behaviour. I dont thing the epidermis has much of a relative role in healing of full-thickness cuts. At the same time, the layers of the epidermis form the primary barrier to infection. The scar will actually represent an 'interruption' in the continuity of of the epidermal barrier: each side separated from the other by the final scar.

    It might be that newer understandings of the healing process have appeared .. in which case you might want to ignore everything i've said (end of obligatory statement of irresponsibility ) ;)))
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