Skin- FOM Flashcards
What are the functions of skin?
- Protection
- Thermoregulation
- Excretion of sweat
- Vit D synthesis
- Sensory reception
What are the functions of the gut?
- Ingestion, propulsion and secretion
- Mechanical digestion
- Chemical digestion
- Absorption
- Defecation
Describe the structure of the gut tube (outward to inward)
- Serosa
- Muscular externa (longitudinal muscle, circular muscle)
- Submucosa
- Mucosa (muscular mucosa, lamina propria, epithelium)
- Lumen
What are the three layers of the skin?
- Epidermis
- Dermis
- Hypodermis
Classify the epithelium found in the epidermis
Stratified squamous keratinised epithelium
What are the 5 layers of the epidermis?
- Stratum basale
- Stratum spinosum
- Stratum granulosum
- Stratum lucidum
- Stratum corneum
(keratin formed at surface)
What are the 2 layers of the dermis?
- Papillary layer- dermal papillae (loose CT)
- Reticular layer- dense irregular CT, connects skin to hypodermis
Describe the hypodermis
- Subcutaneous
- Primarily adipose tissue
- Segregated by loose CT
- Insulation and energy storage
- Major vessels/nerves
Describe the epidermis
- Origin of skin appendages
- Keratohyalin granules kill cell
Describe the stratum basale
Stem cell layer where cell division takes place
Describe the stratum spinosum
Prickle cell layer
Describe the stratum granulosum
Where keratohyalin granules are found
Describe the stratum lucidum
Shine any only found in thicker skin
Describe stratum corneum
Horny layer
What are other cells found in the epidermis?
- Keratinocytes
- Melanocytes
- Merkel’s cells (mechanoreceptors in basal layer)
- Langerhan’s cells (phagocytic cells in spinous and granulosum)
