week 11 Flashcards
Where are touch receptors?
Embedded in outer layer(epidermis) and underlying (dermis) skin
Three criteria of touch receptors?
- types of stimulation to which the receptor
- size of the receptive field
- rate of adaptation
Mechanical stimulation such as pressure, vibration or movement is called
mechanoreceptor
What are slow adapting mechanoreceptors good for?
Perceiving pattern,
texture
shape
Explain the brain pathway for tactile information?
mechanoreceptors transduce mechanical force by which hair cells in the cochlea transduce movement of their stereo-cilia into the neural signal
What are fast adapting mechanoreceptors good for?
Perceiving slip and maintaining grip control
- numerous of tactile receptors
- speed and direction
What is touch physiology?
Knowing the position and the movement of the limbs
How finely can we resolve temporal details?
two tactile pulses can be deleted over time such as
touch
vision
audition
Spatial resolution of touch: two point threshold in regards to assessing spatial resolution?
Threshold smaller on fingertips and lips and larger on arms, legs, and torso
What is the importance of muscle receptors?
kinaesthetic
What is Nociception?
intent of distinguishing between detection of a noxious or potentially harmful event
What is the definition of pain?
Unpleasant sensory and emotional experience associated with actual or potential tissue damage
What is nociceptors?
Sensory receptors that transduce the physical stimuli (damange, heat, chemical) in the epidermis and dermis
What is Sensitisation?
Mechanism that decreases the response threshold of nociceptors
What are A-delta Fibres?
militated axons of nociceptors that transmit pain signals relatively rapidly to produce a rapid response
What are C-Fibers?
Unmylinated axons of nociceptors that transmit pain signals
What are the two pain signals to the spinal cord?
Myelinated
Unmylinated
Warm fibres and cold fibres use ____ Receptors?
Thermoreception
Warm fibre range?
23 - 40
Cold fibre range
10 - 20
If skin temperatures is abruptly warmed from sustained neutral temperature then:
the firing rate of warm fibres increased
If skin temperatures is abruptly cooled from sustained neutral temperature then:
the firing rate of cold fibres increases
What is touch sensation represented by ?
somatotopically in the brain
What is the benefits of pain adaptive sensation?
sensing danger
protect to live
What is the phantom limb?
sensation perceived from a physically amputated limb of the body
expecting something that isn’t there
What is the vestibular system uncharge of ?
Perceiving balance and acceleration
info provided from canals and otolith organs
