L16. Skin and Mucous Membranes Flashcards
Name the 3 layers found in skin
- Epidermis
- Dermis
- Subcutaneous layer
Discuss a feature of the epidermis in skin.
Stratified squamous epithelium with no blood vessels.
Name the 5 stratum layers in skin.
- Stratum corneum
- Stratum lucidum
- Stratum granulosum
- Stratum spinosum
- Stratum basale
(Can Lucy’s Gran’s SKIN Bend?)
What is present in the stratum corneum?
Keratinised dead cells and these are shed regularly.
In which cases is the stratum lucidum present?
Only in thick skin, eg hands and feet as a thin layer of dead cells.
What is present in the stratum granulosum?
waterproof cell layer with keratinocytes.
What is present in the stratum spinosum?
Keratinocytes
What is present in the stratum basale?
Sensory receptors and melanocytes.
Name the 2 layers found in the dermis.
Papillary layer
Reticular layer
What is present in the dermis’ papillary layer?
Capillaries and nerve endings
What is present in the dermis’ reticular layer?
Dense connective tissue
Describe the dermis layer in skin.
A thick layer forming “true skin” with blood capillaries and nerve endings, collagen and elastic fibres.
What causes acne?
Bacteria build-up under the skin
What does psoriasis show as on skin?
Inflamed and flaking skin
What causes pemphigus?
Healthy skin being attacked, forming watery blisters
What causes vitiligo?
Destruction of melanocytes causing white patches on the skin
What are the 2 types of skin cancer? What causes them?
Squamous cell
Basal call
Keratinocytes grow out of control
Name the 3 layers in a mucous membrane.
Epithelium
Basement membrane
lamina propria
Which kind of epithelium lines the oral mucosa?
Stratified squamous
What are rete ridges?
Epithelial extensions that project into the underlying connective tissue
Describe the 2 classifications of medical conditions
Acquired
Congenital (present at birth)
What is lichen planus and which areas does it affect?
Affects skin and mucous membranes
Causes itchy, non-infectious inflamed rash on the arms and legs
What does cystic fibrosis affect?
Respiratory, gastro-intestinal epithelial linings and salivary glands causing viscous secretions
