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MBBS QUESTION #10216
Question 1
A deep laceration extends through the epidermis and full thickness of the dermis but spares the deeper hypodermis. Re-epithelialization of this wound is still possible without needing skin grafting, mainly due to preservation of which structures within the dermis?
  • Epithelial linings of hair follicles and sweat glands, which serve as sources of epidermal regeneration✔️
  • Subcutaneous fat lobules only
  • Deep fascia
  • Skeletal muscle fibers
Correct Answer Explanation
Even when the surface epidermis is destroyed, epithelial remnants lining hair follicles and sweat gland ducts deep in the dermis can proliferate and migrate to resurface the wound; if these adnexal structures are also destroyed (as in full-thickness/third-degree burns), spontaneous re-epithelialization fails and skin grafting is required.