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Series 1: The Skin · Episode 1

The Skin

The Largest Organ You Were Never Properly Taught

21 minutes. 16 references, each checked at source.

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The outermost layer of your body has no blood supply at all. None. Everything the epidermis receives, it receives by diffusion from a single plexus in the dermis beneath it, which means the quality of your dermal closure decides whether the layer above it lives or dies.

Anatomy is poorly taught and often treated as a tickbox exercise. Crammed for examinations, reproduced on diagrams, and quietly forgotten. The forgetting has consequences, and nowhere is that more apparent than in the largest organ in the body.

In this first episode, Dev explores the skin as a surgically applied subject: the avascular epidermis, the vascular architecture of the dermis, and the story of how Ian Taylor's angiosome concept transformed reconstructive surgery in 1987. Understanding it begins not in the operating theatre but here, with the anatomy that was always worth knowing properly.

The Anatomy Purist is for surgeons, trainees and students whose love for anatomy goes far beyond the knife.

Themes from this episode

Practice what you just heard

Two questions on the themes of this episode, free, marked as you go. Then one from the Vault on the same ground.

Question 1 · Applied

In which epidermal layer are Langerhans cells principally found?

Answer to see the explanation and the source.

Question 2 · Foundation

Approximately what proportion of total body weight is accounted for by skin proper, meaning epidermis and dermis?

Answer to see the explanation and the source.

From the Vault, on the same theme

General Principles: Fascia, Compartments & Tissue Planes · Purist Locked

Over most of the body the skin can be pinched up and slid freely, yet in a few regions it is bound down and barely moves; and when a deep lesion later tethers mobile skin, displacing the skin produces a telltale dimple. Which structural system accounts for both observations?

  • ARegional differences in the thickness and density of the dermis itself
  • BA membranous layer of superficial fascia anchoring directly to bone
  • CFusion of the dermis to the investing fascia wherever skin is immobile
  • DRegional variation in the thickness of the subcutaneous fat
  • EFibrous bands crossing the fat from the dermis to the deep fascia

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References

  1. Standring S, editor. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed. London: Elsevier; 2020.
  2. Yousef H, Alhajj M, Fakoya AO, Sharma S. Anatomy, Skin (Integument), Epidermis. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2024. Bookshelf ID NBK470464.
  3. International Commission on Radiological Protection. Basic anatomical and physiological data for use in radiological protection: reference values. ICRP Publication 89. Ann ICRP. 2002;32(3, 4):1, 277.
  4. Leider M. On the weight of the skin. J Invest Dermatol. 1949;12(3):187, 91. PMID 18117764.
  5. Weinstein GD, McCullough JL, Ross P. Cell proliferation in normal epidermis. J Invest Dermatol. 1984;82(6):623, 8. PMID 6725985.
  6. Bergstresser PR, Taylor JR. Epidermal 'turnover time', a new examination. Br J Dermatol. 1977;96(5):503, 9. PMID 871385.
  7. Halprin KM. Epidermal "turnover time", a re-examination. Br J Dermatol. 1972;86(1):14, 19. PMID 4551262.
  8. Iizuka H. Epidermal turnover time. J Dermatol Sci. 1994;8(3):215, 7. PMID 7865480.
  9. Meigel WN, Gay S, Weber L. Dermal architecture and collagen type distribution. Arch Dermatol Res. 1977;259(1):1, 10. PMID 71020.
  10. Weber L, Kirsch E, Müller P, Krieg T. Collagen type distribution and macromolecular organization of connective tissue in different layers of human skin. J Invest Dermatol. 1984;82(2):156, 60. PMID 6693779.
  11. Taylor GI, Palmer JH. The vascular territories (angiosomes) of the body: experimental study and clinical applications. Br J Plast Surg. 1987;40(2):113, 41. PMID 3567445.
  12. Taylor GI, Corlett RJ, Dhar SC, Ashton MW. The anatomical (angiosome) and clinical territories of cutaneous perforating arteries: development of the concept and designing safe flaps. Plast Reconstr Surg. 2011;127(4):1447, 59. PMID 21460653.
  13. Taylor GI, Pan W-R, editors. The Angiosome Concept and Tissue Transfer. St Louis: Quality Medical Publishing; 2014.
  14. Bakamjian VY. A two-stage method for pharyngoesophageal reconstruction with a primary pectoral skin flap. Plast Reconstr Surg. 1965;36:173, 84. PMID 14339173.
  15. McGregor IA, Jackson IT. The groin flap. Br J Plast Surg. 1972;25(1):3, 16. PMID 4550433.
  16. McGregor IA, Morgan G. Axial and random pattern flaps. Br J Plast Surg. 1973;26(3):202, 13. PMID 4580012.
Episode 2: Langer's Lines
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