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- 1components of integumentary systemskin
- hair, nails, glands
- sensory receptors (nervous)
- muscles - 2skin layersepidermis
dermis - 3epidermisupper (superficial)
- 4dermislower (deep)
- 5hypodermisBelow (deep to) skin
- 6Epidermisthinner
-made of epithelial tissue
- stratified squamous epithelium
- avascular (if cut = no bleeding). - 7how many layers epidermis has?5
- 8Epidermis layers:stratum basale
stratum spinosum
stratum granulosum
stratum lucidum
stratum corneum - 9Stratum basalesingle row of cells
- 10types of stratum basalekeratinocytes
melanocytes - 11keratinocytes90%
undergo mitosis
- make keratin (tough protein)
- migrate to surface as new cells made in basale - 12melanocytes(10%)
- make pigment (melanin) (for UV light protection)
ex. against sunburns, wrinkles (collagen damage), cancer (DNA damage) - 13skin colourall same # melanocytes but cells make different
amounts/shades of melanin - 14no melaninalbinism/achromia
- 15stratum spinosumlimited cell division
-has keratinocytes in 8-10 layers - 16stratum granulosum- has dark-staining granules
-has 3-5 layers flat keratinocytes. - 17stratum lucidum- flat, dead cells (too far from blood supply)
- seen only thick skin - 18stratum corneum20 - 30 flat layers
dead cells with keratin (tough
protein)
surrounded by waterproofing glycolipid (prevents
water loss)
- shed and replaced from deeper strata. - 19Dermis-made of dense irregular
-thicker
- has blood vessels, nerves, glands, hair follicles
-vascular, if cut = bleeding - 20layers of dermispapillary layer
reticular layer - 21papillary layerareolar CT
- vascular
- projections to epidermis = dermal papilla
in thick skin, form dermal ridges = fingerprints - 22reticular layer-deeper are dermis
- most of dermis
- dense irregular CT - 23Hypodermis(NOT part of skin)
= subcutaneous layer
= superficial fascia
adipose CT below the skin
store half bodys adipose tissue - 24Fascia= CT layers surround and support organ
- 25Thin skin- lucidum not apparent
- has hair follicles, sebaceous glands, arrector pili muscle - 26Thick skinex: hand palm, foot sole
- lucidum visible
- no hair follicles, sebaceous glands or arrector pili muscle - 27Epidermal Derivativesall derived (made) from epidermis
- 28Epidermal Derivatives typesHair
Nails
Skin Exocrine Glands - 29hairall dead cells
- 30hair partsroot
shaft
hair follicle - 31rootdead cells below skin surface
- 32shaftabove the skin surface
- 33hair follicle– surrounds hair root
- 34subtypes of hair follicleepithelial root sheath
bulb
hair matrix - 35epithelial root sheath:- several epidermal layers extend into the dermis
-internal +external root sheath. - 36bulb= expanded region at root base
has hair matrix
-has hair papilla nourish growing hair follicle. - 37Hair matrixGet from basale cells
Site hair growth and melanin for hair color
Site of cell division - 38Types hair follicle:dermal root sheath
hair papilla
root hair plexus
sebaceous glands
arrector pili muscle - 39Dermal root sheathCT - holds follicle in place
- 40Hair papillaextends upward beneath matrix
- has areolar ct + blood vessel
- blood supply for growing hair + signals for its regulation
- dermal - 41Root hair plexusFree ending touch
- 42Sebaceous glandsOpens to follicle
- 43Arrector pili muscleCause goosebumps
- 44Nailskeratinized epidermal cells
- 45Components of nailsNail root
Body
Free edge - 46Nail rootBuried in skin
- 47BodySeen portion
- 48Free edgeWhite part
- 49Types of Skin Exocrine GlandSebaceous glands
Sudoriferous
Ceruminous
Mammary - 50sebaceous glandsconnected to hair follicles
-secrete sebum (oily – mix of fats, salts) - 51Sebumsoftens, lubricates hair, skin, prevents drying out
- 52sudoriferous glands- sweat glands
- secretory area in dermis of thick + thin skin
- ducts open to skin surface - 53Sweatcools body
antibiotic (acidic)
- removes wastes (urea, etc) - 54Ceruminousmodified sweat glands
in ear canal
- produce ear wax (prevents insects etc from entering - 55mammary glandsmodified sweat glands
- produce milk - 56—
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- Fichas sobre Sin título, creado por Debbie Catalon el 24/10/2021.
- Creado por
- Debbie Catalon
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