Stephen J. Schueler, M.D.

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Burn First Degree Anatomy

To better understand first degree burn, it helps to understand the anatomy of the skin.

The skin contains three main layers:

  • Epidermis:
    • The superficial layer that makes up the surface of the skin
    • It is composed of skin cells and can be divided into 5 layers based on cell type.
    • The top layer of the epidermis, the stratum corneum, is made of dead, flat skin cells that shed about every 2 weeks.
    • The thickness of the epidermis varies, according to location: it is very thick over the soles of the feet, and very thin over the ears.
  • Dermis:
    • Lies beneath the epidermis
    • Also varies in thickness depending on the location of the skin. It is .3 mm on the eyelid and 3.0 mm on the back.
    • The dermis is composed of 2 layers that contain a connective tissue called collagen
    • The dermis contains blood vessels, nerves, sweat glands, and hair follicles.
    • The number of structures in the dermis varies, according to location.
    • The dermis under the arms contains more sweat glands and hair follicles than the dermis on the back.
  • Subcutaneous layer:
    • Mainly fat and connective tissue.
    • Contains blood vessels and nerves.

Last Updated: Dec 13, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Burn First Degree References
  1. Allison K, Porter K. Consensus on the prehospital approach to burns patient management. Emerg Med J. 2004 Jan;21(1):112-4. [14734397]
  2. Drago DA. Kitchen scalds and thermal burns in children five years and younger. Pediatrics. 2005 Jan;115(1):10-6. [15629975]
  3. Phillips BJ, Kassir A, Anderson B, Schiller WR. Recreational-outdoor burns: the impact and severity--a retrospective review of 107 patients. Burns. 1998 Sep;24(6):559-61. [9776095]
  4. Smith MA, Munster AM, Spence RJ. Burns of the hand and upper limb--a review. Burns. 1998 Sep;24(6):493-505. [9776087]
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