1] Evaluation And Intervention Flashcards
8 functions of the skin
Protect from infection Conserve body fluids Temp regulation Excretion Secretion Produce Vit D Appearance Sensation
3 layers of the skin
Epidermis
Dermis
Hypodermis (subcutaneous)
Epidermis has how many layers?
5
What are the 5 layers of the epidermis?
Stratum corneum (outer) Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale (inner)
Outermost layer of the skin
Epidermis
Thickness of eye lids
.05 mm
Thickness of palms/soles
1.5 mm
4 cells in epidermis
Melanocytes
Langerhan cells
Merkel cells
Keratinocytes
Produce melanin, a pigment that contributes to skin color & absorbs UV light to
protect DNA from damage.
Melanocytes
Participate in immune responseby fighting various microbes that invade the skin.
Langerhan cells
Sensory receptor cells that areresponsible for sensation of touch.
Merkel cells
Produce keratin, a tough protectiveprotein that protects skin & creates water repellent
seal.
Keratinocytes
Deepest layer of the epidermis
Stratum basale
Divides continuously
Contains stem cells which continually divide & push
new cells to surface.
Stratum basale
Contains melanocytes and merkel cells
Stratum basale
Thickest layer of the skin
Stratum spinosum
Prickle cells interlock and support skin
S. Spinosum
Involved in transfer of substances in and out of body
S spinosum
Has basal cells and langerhan cells
S spinosum
Which layer initiates keratinization?
S granulosum
How on does keratinization take?
4 weeks
? produce ?, a tough protectiveprotein that makes up the majority of the
structures of the skin, hair, and nails
Keratinocytes
Keratin
What happens as kcytes move through the stratum granulosum and lucidum ?
They enlarge, flatter and adhere together
What happens at the end of keratinization?
Cells fuse together into tough durable material that continues to surface to the skin
Appears only in thethicker areas of the skin, i.e. fingertips, palms, and soles
S lucidum
Comprised of dead keratinocytes &
protects against UVrays.
S lucidum
10-30 layers of continuously shedding dead
keratinocytes which are replaced from below
S corneum
Lipids help seal these dead cells together to form a barrier to keep water out/in.
S corneum
Shedding process is how many days in the young?
26-30
Shredding process is how many days in the elderly?
42-50 days
3 functions of the dermis
Regulate temperature
Give dermis nutrients saturated with blood
Store water
2 layers of the dermis
Papillary
Reticular
Thin arrangement of collagen fibers
Papillary layer of dermis
How is the papillary layer connected to the epidermis?
Via papillae
Sensory touch receptors in the papillary layer
Meissners corpuscle
Contains thick collagen fibers arranged parallel to skin surface
Reticular layer
Reticular layer contains what corpuscles that do?
Pacinian corpuscles that are sensory receptors for deep pressure
What two things in the dermis do you need to help your healing tissue be strong?
Collagen and elastin
Supply nutrients and oxygen to the skin
Takes away cell waste and cell products
Transports vitamin D produced in the skin to the rest of the body
Constricts and dilates to aid with temperature regulation
Functions of blood vessels
Bathes the skin tissues withlymph, a substance that
contains infection-fighting
cells of the immune system
Lymph vessels
Attempt to destroy any
infection or invading
organisms as the lymph
circulates to lymph nodes
Lymph vessels
Average person has approximately 3 million of these
Sweat glands
3 types of sweat glands
Apocrine
Eccrine
Sebaceous
Found only in armpits, areolae of nipples andgenital regions
Apocrine sweat glands
Larger, deeper and produce thicker secretionsthan eccrine glands
Apocrine sweat glands
Become active at puberty
Apocrine sweat glands
Found over the entire body
Collect ducts deep in skin that connect to surface
Eccrine glands
Sweat is a mix of ?
99% water and 1% salt and fats
These glands secrete sweat and regulates body temp
Eccrine glands
Secrete oils that keep skinsupple and smooth,
waterproofs, protects from overgrowth of
bacteria/fungus
Sebaceous sweat glands
Empties via ducts into base of hair follicle
Secretes sebum
Sebaceous glands
What is sebum?
Mixture of fats, waxes and hydrocarbons
Collagen is for ?
Elastin is for?
Durability
Flexibility
Protein is made by
Fibroblasts
Supports epidermis by giving durability
Collagen
Similar protein that keeps skin flexible
Elastin
Nerve endings contain
Pain and touch receptors
Smooth muscle attached to hair follicle
Erector pilli muscles
Has blood vessels, nerves, lymph, hair follicles also cross into this layer
Hypodermis/subcutaneous layer
How do epidermis and dermis heal?
Regeneration