Epidermis, Dermis, Hypodermis

epidermis is made up of how many layers of cells

4-5

how many layers are there in thick skinned epidermis areas

5

how many layers are there in thin skinned epidermis areas

4

epidermis is vascular or avascular?

avascular

primary function of epidermis is

protection and preventing water loss

base/bottom layer of epidermis

stratum basal

stratum basal is also called

stratum germinativum

how many layers thick is stratum basal

1-2 layers

what cells are in the stratum basal

melanocytes, merkel cells, keratinocytes

how much of the stratum basal layer is composed of melanocytes

10-25%

thick layer with large cells in the epidermis

stratum spinosum

second epidermal layer from the bottom

stratum spinosum

cells in the stratum spinosum

keratinocytes, langerhan cells

third epidermal layer from the bottom

stratum granulosum

Is the stratum granulosum thick or thin?

thin

cells in the stratum granulosum

keratinocytes

what layer do keratinocytes flatten

stratum granulosum

what are keratinocytes doing while in the stratum granulosum layer

flattening

the waterproofing layer of the epidermis is the

stratum granulosum

epidermal layer that is only in thick skinned areas

stratum lucidum

stratum lucidum is located in which parts of the body

palms of hands, soled of feet

what epidermal layer is the clear layer

stratum lucidum

how many layers thick is the stratum lucidum

2-3

what cells is the stratum lucidum made up of

100% dead keratinocytes

which epidermal layer is made up of 100% dead keratinocytes

stratum lucidum

which epidermal layer is the extra protective layer

stratum lucidum

what is the top layer of epidermis

stratum corneum

stratum corneum is made up of

all flat and dead keratinocytes

how many layers thick is stratum corneum

20-30

order of epidermis bottom to top

basal/germitavium, spinosum, granulosum, lucidum (if thick skinned areas, omit if thin), corneum

which of the three main layers is thickest

dermis

how many layers are in dermis

2

what are the dermal layers

papillary and reticular

structure of dermis

2 layers, lots of connective tissue

function of dermis layer

flexibility and sensation

which of the dermis layers touches epidermis layer

papillary

What does the papillary layer contain?

capillary loops, meissner's corpuscles

Meissner's corpuscles detect what

light touch, low frequency vibrations

which dermal layer has meissner's corpuscles

papillary

which dermal layer is deeper

reticular

what percentage of dermis does papillary layer make up

20%

what percentage of dermis does the reticular layer make up

80%

which dermis layer sits above cutaneous plexus

reticular

blood vessel supply in the hypodermis

cutaneous plexus

Pacinian corpuscles detect what

deep pressure and high frequency vibration

which dermal layer has pacinian corpuscles

reticular

what detects light touch and low frequency vibrations

meissner's corpuscles

what detects deep pressure and high frequency vibrations

pacinian corpuscles

which main layer is responsible for flexibility and sensation

dermis

which dermal layer has lots of collagen and elastin

reticular layer

layer of dermis responsible for wrinkles and stretch marks

reticular

which main layer is not a true layer

hypodermis

structure of hypodermis

fat and blood vessels

function of hypodermis

fat storage, shock absorber, blood vessels, insulator
or
protection, blood vessel resovoir, temperature regulation