Epidermis Flashcards
Thick skin, layer of epidermis that contain dead keratinocyte are
Startum Lucidum (clear) Startum Corneum (Dry layer)
Sebaceus glands produce _____ that coast the hair shaft and the epidermal surface
oil
epidermis Integumentary sis.
Stratified squasmous epithelium tissue
The major function of merocrine sweat glands are
Thermoregulation
protection
secreation
Sebaceous glands are activated by ____ during puberty in both sexes
sex hormones
Many cell produces in the epidermis produces ___when exposed to uv radiation
Vitamin D
cholecaciferol
The nail plate is compose of
nail body
nail root
free edge
The subcutaneous layer is also know as
Hypodermis
superfical facial
it’s not part of the integument
The cell of startum corneum contains large amount of protein
keratin
The skin is made up of two layer
Epidermis ,dermis and hypodermis
Damaged tissue are normally repaired in one or two ways
Regeneration and scar formation
Tactile cells
Merkel cells
nerve endings for light touch
Epidermis Function (on)
Protectn ion
- Metabolic Regulation (uv produces Vitamin D)
- Prevention of water loss ( epidermis is water resistant)
Epidermis live cell layers
Stratum basale
Stratum spinosum
Stratum Granulosm
melanocytes
produce the brown pigment called melanin uv protective
Kerantinocytes
produce keratin for abrasion resistance
Epidermis dead cell layers
Stratum lucidum (clear) Stratum Corneum (Dry layer)
Dermis functions
- Temperature regulation (sweat glands release fluid)
- Secreation and absorption
- Sensory Reception
Dermis integumentary sistem
Dense regular connective tissue
Dermis layers
Pappillary layer (areolar CT) Reticular layer (thick, dense irregular Ct)
Pappillary layer is compused of (dermis)
Dermal papillae (peglike)
Blood vessels - capillary loops that supply epidermis via diffusion
Meissner’s corpuscles &
free nerve endings – more light touch receptors
Reticular Layer (dermis)
Thick, dense irregular CT
Tension lines (= lines of cleavage) show orientation of fiber bundles & incisions for less scarring.
Pacinian corpuscles (= lamellated corpuscle, “onion”) – deep pressure & vibration sensors
Blood vessels w/ diameter regulation (arterioles)
Vasoconstriction (dermis)
decreases vessel diameter & decreases blood flow & heat retained
Vasodilation(dermis)
vice versa
Arrector pili (dermis
smooth muscle that responds to cold & fear stimuli (goose bumps)
Epidermal derivatives
Hair follicles w/ hair
Nails
Sebaceous glands
Sweat glands
