Class 6 - Somatic Sensations Flashcards
Which body areas have the highest density of sensory receptors?
lips, tip of tongue, fingertips
The 5 tactile sensations are…
touch, pressure, vibration, itch, tickle
Encapsulated mechanoreceptors are attached to ____ fibres and sense __, __, and ___.
A fibres (FAST) touch, pressure, vibration
Free nerve endings are attached to ____ and sense __ and ___.
C fibres (SLOW) itch, tickle
Type I cutaneous mechanoreceptors, AKA
tactile discs
Type II cutaneous mechanoreceptors, AKA
Ruffini’s corpuscles
Lamellated corpuscles, AKA
Pacinian corpuscles
Corpuscles of touch, AKA
Meissner’s
Which type of tactile receptor senses stretching of skin?
Ruffini’s (type 2)
What tactile receptor senses slow vibration and what senses fast vibrations?
slow: Meissner’s
fast: Pacinian
Which touch receptors are RAPIDLY ADAPTING?
hair root plexuses and Meissner’s corpuscles (corpuscles of touch)
Where are Meissner’s corpuscles found?
dermal papillae of thick skin
What types of sensory receptors make up the joint proprioceptors?
lamellated (pacinian) corpuscles, Ruffini (type 2) corpuscles, tendon organs & free nerve endings
Three categories of proprioceptors:
mm spindles (skeletal mm) GTO joint kinesthetic receptors (within synovial joint capsule)
Proprioceptors provide what 3 main types of information?
degree of mm contraction
amount of tension in the tendons
position of the joints
Describe “fast pain”
acute, sharp, prickling
rapid onset
not in deeper tissues
occurs with puncturing, stabbing, cutting
Describe “slow pain”
excruciating, chronic, burning, aching, throbbing
felt in deeper tissues
gradually increases in intensity
more diffuse
When are thermal nociceptors active?
under 15* or over 45*
Are cold or warm receptors more abundant?
cold
Itch & tickle are sensed by what kind of receptors?
free nerve endings
