Skin Histology & Thin skin v/s Thick skin

Layers: (top to bottom)
  • Epidermis
    • Stratum Corneum
    • Stratum Spinosum
    • Stratum Basale (with pigmented/melanin granules) 
  • Dermis
    • Dermal Papillae (which forms our fingerprints)
    • Reticular layer
  • Subcutaneous layer with Adipose tissue
  • Skeletal muscle fibers (not illustrated here)

Hair follicle (numerous, closely packed and oriented at an angle to the surface)
  • Hair bulb
  • Internal root sheath
  • External root sheath
  • Connective tissue
Sebaceous Glands: surround each hair follicle, aggregates of clear cells.

Arrector pili muscle: smooth ms. aligned at an oblique angle to the hair follicle, it contracts to move hair follicle in more vertical position.

Pacinian corpuscles: pressure and vibration sensing receptors.

Other labels: sweat glands and blood vessels (omitted here)
Skin histology diagram, thin skin, thick skin




Imp. Difference between thin skin and thick skin 

Histology of both types is similar only difference is the thickness of epidermis. As skin of Palm and Soles are constantly exposed to wear/tear/abrasion, thickness of epidermis in these regions is more.

Features of thick skin:
  • More numerous sweat glands
  • Lacks hair follicles
  • Also lacks sebaceous glands & smooth muscle fibers

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