Integumentary System Flashcards
Integumentary system is composed of
Skin and it’s accessory organs
Skin and accessory organs
Sweat glands, sebaceous glands, hair, fingernails and toenails
The skin is the largest organ. How much does it weigh?
20 Pounds
Skin serves several important functions. What are they?
-Protection
-Holds the nerve receptors
-Secretes Fluids
-Regulates body temperature
Protection of the skin
-Keeps pathogens out
-Keeps important body fluid in
Nerve receptors held by the skin
-Touch
-Pressure
-Pain
-Temperature
Fluids that secrete from the skin
Mucus, sweat, sebaceous oils
Ways that the skin regulates body temperature
Evaporation from sweat glands & insulation from fat layer
3 types of Epithelial tissue membranes in the body
-Cutaneous Membrane
-Serous Membrane
-Mucous Membrane
Cutaneous Membrane
Visible skin
Serous Membrane
Skin lining the body cavities and organs
Mucous Membrane
The skin that lines all the body openings
3 layers of the Cutaneous Membrane
-Epidermis
-Dermis
-Subcutaneous
Epidermis
The outermost layer composed of stratified squamous cells
Dermis
The second layer which supports all the working parts of the skin
Subcutaneous
-Fat layer composed of lipocytes
-provides insulation
-Works as a shock absorber
-Stores water
Dead skin cells are filled with?
Protein called keratin that holds them together and makes the skin waterproof
The deepest layer is called?
The basal layer where the cells are born
Melanocytes
Secrete a black pigment called melanin
Blood vessels
Arteries, veins, capillaries
Nerves
Provides a sense of touch
Sweat glands
Cool the body
Sebaceous glands
Secrete oil to keep the skin lubricated
Hair follicles
Always associated with sebaceous glands
Arrector pili muscles
Pulls hair upright
Collagen
Protein that holds skin together and gives it elasticity
Fingernails and toenails
Hard keratin plates to cover the end of fingers and toes
Nail body
Visible part of nail
Lunula
Crescent shaped white area near the nail root
Nail root
The portion of the nail under the skin surface that holds the nail in place in from which it grows
Free edge
The portion of the nail that extends beyond the finger or toe
Nail bed
The epithelium visible under the nail
Lesions of the body are identified by the location size in appearance
Papule
Nodule
Macule
Vesicle
Wheal
Pustule
Ulcer
Fissure
Cicatrix
Keloid
Cyst
Papule (pimple)
Firm raised lesion, less than .5 cm.
Nodule
Elevated,solid lesion that is deeper than a Papule, 0.5 to 2 cm
Macule
Flat discoloration less than 1 cm in diameter
Vesicle
Thin walled blister filled with fluid less than 0.5 cm in diameter, larger blisters are called bulla
Wheal
Transient raised lesions or irregular shape with a light center, size varies
Ulcer
Open lesión caused by disintegration of the skin
Decubitus ulcer
Bed sore caused by constant pressure
