Sensory Practical Flashcards
Which areas have the most touch receptors
Why
Lipids / fingers
Greater density as more needed in these areas
Name the 4 touch receptors
Merkels disc
Meissner corpuscles
Krause end bulbs
Root hair plexus
What are the 2 pressure sensors
Pacinian corpuscles
Ruffin endings
Where do primary receptors have more overlapping receptor fields
Calf
How many signals are sent when receptor field is activated
1
In cold water what’s activated
Pain receptors
What causes numbness in cold water
Touch receptors not working well
When put back into room temperature water,
why do cold hands feel warmer
Why do warm hands feel colder
Both have adapted to the first temperature via free nerve endings
Acuity meaning
Determining the location of the stimuli
Why is sensing temperature at high acuity not easy
Thermoreceptors are spaces out in the skin
Not a high acuity
What does sensing temperature over a larger area enable
Helps with thermoregulation
Why don’t thermoreceptors fire at body temperature
They’re inactivate at 37*
Stops spontaneous activation
Define the field of vision
Entire area seen by the eye when fixed in one position
Why can determining he visual fields be useful?
Help in determining blindness
Help in localising brain lesions
What sees white light
Rods
