Integumentary System Aka HAIR SKIN AND NAILS Flashcards
Functions
Protection, vitamin D, production, temp. Regulation, water retention, sensation, nonverbal communication
Skin layers (2)
Epidermis (superficial), and dermis (deep layer)
“Third layer of skin”
Not really a layer but attaches skin to the body
Hypodermis
Cutaneous layers
Epidermis and Dermis
Subcutaneous
Hypodermis
Hypodermis tissue
Adipose (fat) connective tissue
PROTECTS US FROM INJURY… so the more fat the better? Bring on the Chipotle
Epidermis tissue
Top layer, stratified squamous epithelial tissue
Dermis tissue
Loose/areolar connective tissue OVER the dense irregular connective tissue
LAYERS of the Epidermis (4- thin skin, 5- thick skin)
1 Stratum basale (think b=base), division to make new epidermis
2 Stratum spinosum, desmosomes (attach cells to one another), proteins
3 Stratum granulosum, oil/keratin production
4 Stratum lucidum, only in THICK SKIN
5 Stratum corneum, not living, the shell, durable, desmosomes break down and flake off
Where thick skin is found
In areas of consistently high abrasion, soles of feet, palms, lips
B, S, G, L, C
Memorize for layers of epidermis, in order from bottom to top
Stratum
Basale, Spinosum, Granulosum, Lucidum, Corneum
Keratinocytes
Creates keratin (hard protein=durability for skin, hair, and nails this process is called cornification or keratinization
Exfoliation/ desquamation
Desmos break down, cells flake off
Melanocytes and Melanosomes
Gives pigmentation to skin, this is genetic, in the epidermis
Dermis
Papillary region and reticular region
Papillary region
Superficial, fingerprints/toe prints (helps us grip, identify), elastic fibers
Reticular region
Deeper, collagen (strength) and elastic fibers (flexibility, ability to return to original position)