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Integumentary System (Skin). Integumentary System. Structure: Epidermis: Stratum corneum: dead cells, mostly keratin. Stratum lucidum: dead keratyoncytes; not present in all the skin. Stratum granulosum: Lamelated granules (waterproofing) Keratohyaline granules.

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Integumentary system
Integumentary System

  • Structure:

    • Epidermis:

      • Stratum corneum: dead cells, mostly keratin.

      • Stratum lucidum: dead keratyoncytes; not present in all the skin.

      • Stratum granulosum:

        • Lamelated granules (waterproofing)

        • Keratohyaline granules.

      • Stratum spinosum: prekeratin.

      • Stratum basale

    • Dermis

      • Papilar layer

      • Reticular layer

  • Function

    • Protection

      • Insulation

      • Chemical damage

      • Bacterial invasion

      • Dehydration

      • Temperature regulation

    • Secretory

      • Urea, salts, water

    • Synthesis of vitamin D

    • Sensory



Cells in the epidermis
Cells in the Epidermis

  • Keratynocytes

    • Produce keratin

  • Melanocytes

    • Produce melanin pigment

  • Langerham’s cells

    • Immunity

  • Merkel cells

    • Touch receptors


Cells in the dermis
Cells in the Dermis

  • Meissner’s corpuscles

    • Papillary layer (areolar conective tissue): pain and touch receptor.

  • Paccinian corpuscles

    • Reticular layer (dense irregular): pressure receptor.



  • "Cher Likes Getting Skin Botoxed" (from superficial to deep)

  • "Before Signing, Get Legal Counsel" (from deep to superficial)

  • "Before Sex Get Latex Condoms (from deep to superficial)



Accesory organs of the skin
Accesory organs of the skin

  • Nails

  • Hair

    • Hair

    • Follicle

    • Arrector pilli muscle

  • Cutaneous glands

    • Sebaceous: skin moisture.

    • Sweat

      • Ecrine (merocrine sweat glands) temperature regulation through perspiration.

        Appocrine:axillary and genital area (fats, water, salts, urea): pheromones?


Nails

Figure 5.6



Hair (transverse view)

Figure 5.5a, b





Sweat gland

Figure 5.3b


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