Integumentury

Question 1

Keratinocytes life cycle

Answer 1

Begins in the stratum spinosum

Sheds in the stratum corneum

Can shred from environmental and physical stress

Shed cells are replaced by mitosis

Cels primarily devide at night

Question 2

Dendritic cells (langerhan) cells

Answer 2

Found in stratum spinosum

Phagocytes of the immune system

Protects the skin and underlying tissue from pathogens

Question 3

Merkel cells

Answer 3

Oval cells found in the stratum bassale

Sensory receptors that detect light,touch,shapes and textures

Also found in fingerprints, lips and base of hair

Question 4

Melanocytes

Answer 4

Found in stratum bassale

Produces melanin a protein that give’s colour to skin

Question 5

Thick skin

Answer 5

Consist of five layers of the epidermis with thick stratum corneum

Equivalent to the size of a paper towel

Lacks hair follicles

Contains sweat glands

Contains in palms of hands and sole of feat

Could have lots of mechanical stress

Question 6

Thin skin

Answer 6

Consist of only four layers of the epidermis,lacking the stratum lucidium

Equivalent to the size sheet of printing paper

Has hair follicles

Less mechanical stress

Question 7

Dermis

Answer 7

Houses blood supply

Anchors epidermis in place

Two layers

Palpilary layer

And recticuler layer

Question 8

Papillary layer

Answer 8

Most superficial layer of the dermis

Consists of loose conective tissue

Collagen fibers anchor dermis and epidermis together

Question 9

Dermal papillae

Answer 9

Found in the surface of the papillary layer

Houses tiny blood vessels called capillaries

Houses sensory receptors called tactile meissner corpuscles

Question 10

Reticular layer

Answer 10

Deepest and thickest layer of the dermis

Consists of dense irregular connective tissue

Collegen that strengthen the dermis

Elastic fibers that allow skin to revert after stretching

Protectoglycocan that hydrates the skin

Blood vessels and accessory structures

Sensory Receptors