chapter 10 Flashcards
skin
what’s another name for skin and the connective tissue beneath it?
integuement
what’s the integumentary system?
used when considering the integument as a body system
what does skin do?
covers the body and acts as a barrier between the internal and external environment
what are the 2 primary layers of skin?
- epidermis
- dermis
what’s the epidermis?
superficial thinner layer of skin
what’s the dermis?
deep thicker layer
what’s a dermoepidermal junction?
area where cells meet the connective tissue cells of the dermis
what’s the hypodermis?
beneath the dermis and is rich in fat and loose fibrous tissue
what is most of the body covered by?
thin skin
what are examples of thick skin? 3
- hairless skin covering palms of hands and fingertips
- soles of feet
- other areas subject to friction
what are friction ridges?
they form fingerprints and help us grip things
what is keratin?
tough fibrous protein and they make up 90% of epidermal cells
what are melanocytes?
contribute colored pigments to skin and decrease the amount of UV light that can penetrate deeper layers of the skin
what is vitiligo?
loss of pigments in certain areas of the skin
what are the five distinct layers of cells strata?
- stratum basale
- stratum spinosum
- stratum granulosum
- stratum lucidum
- stratum corneum
what’s the stratum basale?
single layer of columnar cells that are responsible for the continual regeneration of the epidermis
what’s the stratum spinosum?
above the basale layer and consists of several layers dividing keratinocytes
what’s the stratum lucidum?
very flat closely packed and clear and provides additional strength to skin and helps with skin hydration
what’s the stratum corneum?
most superficial layer and acts as the protective barrier of the skin
what’s the stratum granulosum?
where the process of surface keratin formation begins and it helps the skin barrier become harder to penetrate by producing keratin
what two layer is the dermis composed of?
thin papillary and thick reticulum
what’s dermal papillae?
dermis bumps that help bind the skin layers together
what does the reticular layer do?
provides structural support and elasticity to the skin
