Skin Flashcards
4 primary tissues
Connective, epithelial, muscle and nerve
Epidermal cells
Keratinocytes to produce keratin
Functions of skin
Epidermis - prevent water loss
Dermis - reduce risk of injury/environment control
UV and immunological protection
Name 3 broad layers of skin
Epidermis
Dermis
Hypodermis
Name the 4 main cell types found in the epidermis
- Melanocytes -> pigment
- Keratinocytes -> waterproof
- Merkel cells -> touch
- Langerhans cells -> immune
Name the layers of epidermis
- Stratum Germintium - columnar, melanocytes, merkel
- stratum spinosium - desmosome create spine
- stratum granulosum - keratohylin for keratin
- stratum lucidium - no organelles
- stratum corneum
Keratinisation
Keratin deposits in cells and become horny eg dead skin, nails hair
Autoimmune disease -> psoriasis
Dermis layers (2)
Papillary layer
Reticular layer
Papillary layer
Loose connective tissue
Nerve endings
Blood vessels
Macrophages
Reticular layer
Dense irregular - collagen and elastic fibres
Arrector pili muscles
Muscle contracts
Sebaceous glands
Between follicle and muscle
Secret sebum
Eccrine sweat glands
Simple tubular secrete into dermis duct
Thermoregulatory
Meissners corpuscles
Light touch
Paccinian
Vibration and pressure
