Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

integumentary system

Integumentary system "covering" 2 regions
2 regions of integumentary system 1. epidermis 2. dermis
epidermis epithelial cells outer most shield avascular+ innervated gets nutrients from dermis by diffusion
Dermis much thicker and tougher. made of fibrous conn. tissue vascularized
Hypodermis( Superficial Facia) deep to the skin. contains fat/adipose tissue and some areolar stores fat and anchors to muscle and allows skin to slide shock absorber, contains unwanted fat.
epidermis keratinized strat. squamos -4 cell types -4~5 layers
4 cells of epidermis 1.keratinocytes 2.melanocytes 3.langerhan 4.merkel
Keratinocytes -most numerous. makes keratin -increased in areas with more friction(hands/feet) -tightly bound by desmosomes -highly mitotic(dividing) -cells dead at surface -24-45 day life span
melanocytes -makes melanin -make colored pigment in deepest epidermis -spidershaped. arims that touch every keratinocyte in basal layer -melanin travels to top layer..protects from uv rays
langerhan's cells -rise from bone marrow. move to epidermis -asters go around keratinocytes -phagocytes that take in foreign substances& help activate immune system
Merkel Cell -spiky hemisphere shape -in epidermal with dermal junction each is connected to a sensory disclike nerve called merkel disc.
Merkel disc senses touch
Layers of Epidermis 4-5 layers -5 in thicker skin areas s=stratum s. Basale s. Cornuem s. lucidem s. spinosum s. granulosum
s. basale (bottom layer) deepest, attached to the dermis -single layer of cells. has youngest keratinocytes -germinating layer(growing) -highly mitotic -aka. Stratum germinativum -high # of melanocytes(10-25% of layer)
Stratum Germinativum s. basale
s. Spinosum -7 cell layers thick -contain weblike system~ Intermediate filaments -prickly name from shrinking due to diminishing nutrients yet maintains desmosomes -langerhan's cells most abundent
Intermediate Filaments tension resisting bundle of keratin. - in stratum spinosum
s. Granulosum (granular layer) -cells flattened, nuclie disappear& accumulate - has 2 granules -cells die above this layer
Granules in s. Granulosum !. keratohyaline- keratin aggregation 2. lamellated granules- water proof glycolipids. "plated"
S. lucidem -"clear layer" -only present in thick skin -thin translucent layer -flattened keratinocytes -keratohyaline attaching to keratin
s. coreum -horny layer -75% of epidermis -20-30 cell layers thick mostly dead calls -aids in avoiding abrasions -dandruff comes from this -average person will shed 40 lbs/lifetime
Created by: britsiaj



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards