Skin

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created 3 years ago by Butterflytoos
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updated 3 years ago by Butterflytoos
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1

SKIN

THERE ARE 3 DIFFERENT LAYERS
• 1. Epidermis (4-5 layers)
• 2. Dermis
• 3. Hypodermis = Deepest (also called Subcutaneous)

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Funtion of skin

  • Protection against microorganisms
  • Retards water loss
  • Regulates temperature
  • Houses sensory receptors
  • Houses immune cells
  • Makes vitamin D
  • Excretes waste
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Epidermis

  • Top layer of the skin composed of stratified squamous epithelium
  • Avascular
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Layers of the epidermis from deep to superficial

  • Stratum basale
  • Stratum spinosum
  • Stratum granulosum
  • Stratum lucidum
  • Stratum corneum
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stratum basale

  • the deepest layer of the epidermis where the growth occurs
  • also known as stratum germinativum
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Stratum spinosum

  • Functions as the waterproofing layer of the skin that prevents fluid loss
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Stratum granulosum

  • Main function of keratohyalin granules is to bind intermediate keratin filaments together
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Stratum lucidum

  • Palms of hands
  • Soles of feet
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Stratum corneum

  • The horny outer layer of the skin.
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Cells of the epidermis

  • Keratinocyte
  • Melanocyte
  • Langerhan's cells
  • Merkel cell
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Dermis

  • The second layer of the skin that is composed of two layers with areolar and dense irregular connective tissue
  • Vascular
  • Contains the glands, hair, etc, and nerves
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Layers of dermis from deep to superficial

  • Stratum reticulare
  • Stratum pappilare
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Hypodermis

  • Third layer of the skin
  • Also known as subcutaneous layer, made of loos connective tissue including adipose tissue, vessels and nerves
  • Insulates
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Layers of hypodermis

  • Adipose
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Accessory structures

  • Hair
  • Nails
  • Oil producing glands (sebaceous and meibomian)
  • Sudoriferous glands (eccrine, apocrine, ceruminous, ciliary, mammary)
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Eccrine gland

  • Type of sudoriferous (sweat gland) that helps to regulate body temperature
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Apocrine sweat gland

  • Type of sweat gland found in the armpits and pubic area, releases perspiration due to emotional response, active after puberty
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Mammary gland

  • Type of modified sweat gland that secretes milk
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Ceruminous gland

  • modified type of sweat gland that secretes cerumen (ear wax)
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Sebaceous glands

  • Oil glands
  • Secrete sebum to keep skin soft, pliable and protect against growth of bacteria
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Sudoriferous glands

  • Sweat glands, help to cool the body
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Dermal papillae

  • Create fingerprint pattern
  • Contain capillaries that feed the epidermis
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What is the difference between thick skin and thin skin?

Thick skin contains the layer stratum lucidum. (Extra layers of dead cells found in areas that are under lots of friction)

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Epidermis diagram

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Dermis diagram

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Hypodermis diagram

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Skin diagram

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