Touch Flashcards
(33 cards)
Name the four cutaneous mechanoreceptors.
Meissner corpuscle.
Merkel cell.
Pacinian corpuscle.
Ruffini endings.
Name the two superficial cutaneous mechanoreceptors.
Meissner corpuscle.
Merkel cell.
Name the two deep dermis cutaneous mechanoreceptors.
Pacinian corpuscle.
Ruffini endings.
Which mechanoreceptor is RA1?
Meissner corpuscle.
Which mechanoreceptor is RA2?
Pacinian corpuscle.
Which mechanoreceptor is SA1?
Merkel cell.
Which mechanoreceptor is SA2?
Ruffini endings.
What size receptive field does a Meissner corpuscle have?
Small.
What size receptive field does a Merkel cell have?
Small.
What size receptive field does a Pacinian corpuscle have?
Large.
What size receptive field does a Ruffini ending have?
Large.
Which pathway of the spinal cord do peripheral nerve fibres travel along?
Dorsal column medial lemniscal pathway.
Name the four peripheral nerve fibres.
C-fibres.
A-alpha fibres.
A-beta fibres.
A-delta fibres.
What do columns D2, D3, D4 and D5 represent in the cortex?
Individual fingers.
How many layers do the finger columns have?
Six.
What is intercolumnar communication?
The finger columns communicate with each other.
What is intracolumnar communication?
The layers within a finger column communicate with each other.
Why does information become more complex in S2 compared to S1?
S2 is a higher order processing area.
Where do the peripheral nerve fibres project to from the dorsal horn?
Up to the brain stem and/or thalamus.
Where does sensory information travel to from the thalamus?
To subcortical structures and then to S2.
Name the four Brodmann’s areas that active touch engages.
5, 7, 39 and 40.
What is the role of Brodmann’s area 5?
Integrates postural and proprioceptive information with touch.
What is the role of Brodmann’s area 7?
Integrates visual data with touch, such as hand-eye coordination.
What is the role of Brodmann’s area 39?
Involved in language and number processing, spatial cognition, memory retrieval and attention.
