SKIN ANATOMY TEST

2 layers of dermis

Papillary, reticular

How does epidermis get oxygen and nutrients if it’s avascular

Capillary loops

What’s oil called

Sebum

Pacinian corpuscle

Sense heavy touch, like as pressure and vibrations

Dermal papillae

“Skin nipples”, ridges binding epidermis and dermis together, create fingerprints

Adipose tissue

Absorbs shock and cushions our body as we move about, flexibly binds skin to underlying muscle tissue, insulates body heat

Arrector pili muscle

Contracts to raise hair on end

Capillary loops

Drops off blood filled with oxygen and nutrients to skin

Meissners corpuscle

Sense light touch

Hair follicle

Tunnel that hair grows out from

Sensory nerve

Send messages from sensory structures in skin to brain

Vein

Takes away blood filled with carbon dioxide and waste from skin

Sebaceous gland

Oil glands

Blood vessels

Narrow blood vessels in dermis that deliver blood and remove blood

Motor nerve

Send messages from Braun to muscles and glands in skin

Sudiferous glands

Sweat glands

Free nerve endings

Sense pain heat cold itching tickling

5 functions of skin

Protection, body temp regulation, sensing, vitamin d synthesis, excretion

How does anatomy of epidermis protect body

stratified and keratinized and lipids secreted by lamellar  bodies so skin water resistant and prevents water loss

What’s acid mantle

Skin secrete it cause skin surface teem with bacteria slows bacteria growth

What other funcs do sweat and sebum serve to protect bidy

Ingredients to kill bacteria

How does melanin protect our body

Shield epidermis cells, prevent UV rays damage

Langhernhan cells purpose

Ingest foreign invaders and notify immune system calling other immune cells and triggering immune response

Body cools off by

Sweat Evaporating pulling heat away and blood vessels dilate bring ping hot blood to surface to release heat

Skin warm up

Blood vessels constrict pulling blood vessels to trap heat

3 sensing structures

Free nerve ending, meissners corpsucles, pacinicn corpuscles

5 things free nerve ending sense

Pain, heat, cold, tickling, itching

Skin produces what and whem

Vitamin d when exposed to UV rays

Why is vitamin d important

Helps digestive tract absorb calcium

What happens if deficient I. Vitatim d

Rickets causing weak bones

Minor waste products excreted thru skin

Salt, water, small amounts of urea

whats another name for skin

integument

how many sq meters does your skin measure

2.2 sq meters

what percent f your body weight is skin

15

how many layers of skin and what called

2, epidermis and dermis

deepest layer not technically apart of skin

subcutaneous

most su-perficial layer

epidermis

also called hypodermis

subcutaenous

avascualr

epidermis

vascular

dermis

made of adipose tissue

subcutaneous

made of epithieal tissue

epidermis

made of connective tissue

dermis

majority

dermis

protective layer that surrounfs bodhy

epidermis

What are the four types of cells and make up the epidermis?

Keratinocytes Langerhan melanocytes and Merkel

Which type of epidermal cell is the most abundant?

Keratin sites

Why is keratin important within our epidermis?

Protect from abrasion and penetration, Remains waterproof

As keratin sites move from the basale To the corneum What happens to them?

They flatten and die

What causes more keratinocytes To be produced in our epidermis

Friction

How many days does it take to have a completely new epidermis?

25-45

Dendritic cells

Langerhan

Also known as tactile epithelial cells

Merkel

Produced in bone marrow

Langerhan

Present for the epidermis and dermis meet

Melanocytes

And just for substances that enter the skin and notify and activate our immune system

Langer Hahn

Sense light touch

Merkel

Found in basale

Melanocytes

Spider shaped

Melanocytes

Found in spinousum

Langerhan

Millions shed and die daily

Keratinocytes

Where is epidermis Thick

Lucidium

How many layers of epidermis and what are they in order?

5: Corneum, luciudum, grandulsoum, spinosum, basale

In what layers are keratinocytes dead

Corneum lucifium

In which layers of the epidermis are keratinocyte living

Granulosum spinosum in Basel

In which layer of the epidermis are granules produced

Granulosaum help form keratin in upper strata

In which layer of the epidermis are lameller bodies produced

Granulosum, Release lipids that waterproof our skin

Why are keratinocytes constantly being pushed upwards?

Because they constantly shed

Superficial layer

Corneum

Where keratinocytes are connected by desmosomes and appear Spiny

Spinosum

Where keratinocytes Lose their nuclei and completely die

Lucidum

20 to 30 layers of squamous cells that lack nuclei

Corneum

Waterproof skin

Corneum

Attached to the dermis

Basale

Where are Lameller bodies are released

Granulosum

Deepest slayer

Basale

Composed of a single layer of stem cells that constantly and quickly undergo mitosis to produce kertinocute

Basale

Clear layer

Lucidium

Where keratinocytes Are living, but start to die

Granulosum

Highly keratinized

Corneum