Sensory Physiology Flashcards
________________: process initiation by external stimulus acting on sensory receptors which produces a nerve impulse to the brain
Sensation
___________: receiver of sensory stimulus. Dendrite end of neuron. Converts sensory signal to electrical signal
Receptor
___________: external receptor
Extero-receptor
___________: internal receptors
Entero-receptor
Joint receptor
Proprioceptors
_____________: Although the brain interprets the sensation, it projects the sensation back to the location of the stimulus so that it is as though you feel with your fingers not your brain.
Projection
________________: occurs for all sensations except pain. If the stimulus is unchanging, the receptors stop responding – e.g. like not noticing a particular odor after awhile.
Adaptation
_____________: is when the receptor is still responding for a SHORT time after the stimulus is gone. Try this by staring at a light then closing your eyes. You can still see the light for a short period of time because the receptros are still responding
Afterimage
___________: is the ability to tell one sensation from another (e.g. temp. from pressure)
Modality
_________receptors: respond to physical change (touch, pressure)
Mechano
_________receptors: respond to pain
Noci
_________receptors: respond to temperature
Thermo
_________receptors: respond to chemicals
Chemo
_______________: The ability to tell 2 closely spaced points as distinct and separate points. The denser the receptors, the better
2 point discrimination
_________: sharpening of the sensation. If receptors in the center are strongly stimulated and ones toward the periphery are weakly stimulated, the stronger pathway inhibits the weaker pathway.
Lateral inhibition
__________: the area served by a receptor. Small where sensitive.
Receptor field
Touch receptors are _______________. They are located near the surface of the skin and respond to light touch
Meissner’s or Touch corpuscles
____________ are deeper than meissner’s corpuscles and respond to pressure
The Pacinian or Lamellated corpuscles
Repeated stimulation of tactile receptors leads to vibration. T or F?
T
Thermoreceptors are free nerve endings (not encapsulated) and so are pain receptors. T or F?
T
if you over stimulate any receptor you can get a pain sensation (e.g. extreme cold) T or F?
T
____________: interpret visceral pain incorrectly as surface/somatic pain. For example, your brain thinks that your left arm and shoulder hurt when it is really visceral pain from your heart.
Referred pain
____________: skeletal muscle cells with a neuron ending wrapped around it that respond to stretch of the muscle
Muscle spindles
_______________: located in the tendon and respond to contraction of the muscle.
golgi tendon organs
__________ and _____________ work together to provide your brain with “muscle sense” or proprioception.
Muscle spindles
Golgi tendon organs
If you close your eyes and have your elbow bent, you know it is bent without looking at it. This is do to ________________
Proprioception
