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Integumentary System


dermis -L- deep to epidermis. made of outer areolar tissue and inner dense connective tissue. -contains hair follicles, oil and sweat glands, sensory receptors, nerve fibers, blood vessels and lympathic vessels
Cells of dermis firbroblasts, macrophagesm, mast cells and blood cells
layers of dermis -L- papillary layer and reticular layer
papillary layer/region -L- areolar connective tissue that has many blood vessels which nourish the epidermis and are involved in thermoregulation. contained dermal papillae and is thin and superficial to reticular layer
dermal papillae -L- Messner's corpuscles (touch) and free nerve endings (pain)detect stimuli. - help create large ridges in fingers and feet for finger printing
subcapillary plexus capillary loops
reticular layer -L- dense irregular tissue and collagen in extracellular matrix. - functions for strength, elasticity and collagen which binds water to keep skin hydrated. accounts for 80% of dermis
contributers to skin color melanin, carotene and hemoglobin
melanin polymer of tyrosine amino acids creating a clor from yellow to brown or black
tyrosinase -L- enzyme that is the key to production in melanin
carotene orange pigment found in plant products . accumulates in stratum coreum and in fatty tissue of hypodermis resulting in orangish tinge
eumelanin -L- brown to black pigment synthesized in ellipsoidal melanosomes
pheomelanin -L- yellow to red pigment synthesized in spherical melanosomes
exterorecptor -L- a receptor that detects stimuli external to the body
exteroreceptor structure -L- unencapsulated or encapuslated (connective tissue encircles nerve ending)
unencapsulated nerve endings -L- free (naked) dendritic nerve ending and root hair plexus
free (naked) dendritic nerve ending -L- detects pain (nocioceptors), heat/cold (thermoceptors), and stretch (proprioceptors). - found in body tissue dermis, cornea, ligaments, tendons
root hair plexus -L- detects movement of hair. - found in and around hair follicles
encapsulated nerve endings -L- meissner corpuscle - ruffini's corpuscle - pacinian corpuscle - krause's end bulb
meissner corpuscle -L- feels light touch. - found in dermal papillae, especially in hairless skin
ruffini's corpuscle -L- feels stretching, deep and continous pressure. - found in dermis, joint capsules and subcutaneous tissue
pacinian corpuscle -L- feels pressure and vibration. - found in subcutaneous tissue and dermis
krause's end bulb -L- feels light touch. - found in mocous membrane (moving down esphagus
Created by: karin.thompson