Chapter 5 Flashcards
Epidermis
Thin upper layer
Integument
Skin. Includes hair nails and excretory glands.
Dermis
The under layer
Accessory organs
Hair nails and excretory glands
Hypodermis (subcutaneous layer)
Fat layer protecting major blood vessels
Functions of integument
Protection Excretes salts Maintains body temp Forms vitamin B Stores nutrients Touch receptors
Causes hardening
Keratinocytes
Palms and soles of feet
Thick epidermis
Eyelids and belly button
Thinnest epidermis
Basale
Deepest layer
Basal cell
Skins stem cell
Markel cell
Sensitive to touch
Melanocytes
Brown pigment cells
Spinosum
Above basale layer
Cells are still dividing
Langerhans cell
Fights infection
Granulosum
Cells do not divide
Make keratin
Keratin
Protect and harden hair skin and nails
Lucidium
Only found in thick areas
Soles of feet and palms
Corneum
Surface layer
Lasts 2-3 wks
Gradual evaporation throughout the day
Insensible perspiration
Out of glands, depending on activity
Sensible perspiration
Caused by epidermal pigments and dermal pigments
Skin color
Carotene
Orange-yellow
Help w vision. Vitamin A
Melanin
Brownish-yellow-black
Protects from UV Rays
Hemoglobin
Reddish- pink found in blood and carries oxygen.
Hemoglobin: flushed skin
Dialated vessels
Hemoglobin: cyanosis, blue
Constricted vessels
When blood vessels expand, you look more red. When blood vessels constrict, you look more blue.
Dermal circulation
Contains dermal papilla, sensory neurons and capillaries
Superficial papillary
Deeper. Holds structure in place.
Reticular layer
Loss of elastin in dermis due to UV exposure
Wrinkles
Meissner corpusles
Light touch
Pacinian corpussles
Heavy pressure
Hair structure- root
Anchors hair to skin
Hair bulb
Surrounds hair follicle and connects it to blood vessels and nerves
Hair shaft
Above the skin
Cuticle
Outer surface
Cortex
Middle layer with thick layer of keratin
Medulla
Inner core
Straight hair
Round follicle
Curly hair
Flat follicle
Lanugo hair
1st hair to form in embryo
Vellus
Fine hair on body. Most common
Terminal
Heave dark coarse and curly
Caused by melanin levels
Hair color
High levels of melanin
Low levels of melanin
Dark
Light
Functions of hair
Protect
Insulate
Clean air
Sensory
Arrector pili muscles
Smooth muscles attached to hairs and make them stand on end
Hair growth
Grows for 2-5 years
Club hair
Hair at the end of its life
Sebaceous glands
Oil glands.
Lumen
Ducts of oil glands
Sudoriferous glands
Sweat glands
Apocrine sweat glands
Secretes into hair follicle
Eccrine
More numerous, smaller
Functions of sweat glands
Fools body temp
Releases water and electrolytes
Protects against bacteria and viruses
Mammary gland
Breasts and release milk
Ceruminous
Release ear wax
Dead hardened tightly packed cells
Nails
Visible part of nail
Nail body
Free edge
Front of nail
Skin sides that touch nails
Nail folds
End of finger tip
Hyponychium
Non visible back of nail
Nail root
Cuticle
Eponychium
Lunula
White half moons at base of nail
Steps to repair
Bleeding
Scab forms
Fibroblasts form new skin tissue
Scab is shed
1st degree burn
Pain and redness
2nd degree
Epidermis and dermis damaged
Blisters and pain
3rd degree
Epidermis dermis and hypodermis damaged
Loss of sensation
Erythmema
Redness of skin
20% burns are dangerous because
Fluid loss
Cannot regulate body temp
Bacterial infection likely
Sepsis
Widespread body and blood infection
Autograft
Animal skin
Xenografts
Animal skin
Allograft
Donor skin
Split thickness
Epidermis and dermis taken
Top 2
Full thickness
All 3 layers