sensory system Flashcards
synesthesia
a perceptual phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.
general senses
receptors found throughout the body, including joints and organs
special senses
specialized receptors found in the head (eyes, ears, mouth)
sensations
feeling that occurs when a brain interprets a sensory nerve impulse
projection
the brain causes a feeling to stem from a source
sensory adaptation
sensory receptors stop sending signals when they are repeatedly stimulated
3 types of receptor cells
structural, position, function
structural receptors
-Free nerve endings (dendrites embedded in tissue as receivers. responds to pain and temp)
-Encapsulated (embedded in connective tissue to increase sensitivity. pressure and touch)
-Specialized receptors in the retina of the eye
positional receptors
-Extrocepter (located near external environment. skin)
-Interocepter (interprets stimuli from internal organs)
-Proprioceptor (located near moving body parts, interprets position)
functional receptors
-Chemoreceptor (chemicals, mostly found in nose/mouth)
-Osmoreceptor (respond to solutes in body fluids)
-Thermoreceptors (temp)
-Mechanoreceptors (pressure, vibration, body position)
-Nocireceptor (pain)
visceral pain
occurs in visceral tissues such as heart, lungs, intestine
referred pain
feels as though it is coming from a different part (heart pain may be felt as pain in arm or shoulder)
acute pain
originates from skin, usually stops when stimulus stops (needle prick)
chronic pain
dull aching sensation
baby pain index
F- face
L- legs
A- activity
C- cry
C- consolability
