Brain Bee Chapter 5 - Jacey Flashcards
what does Ruffini’s ending sense?
slowly changing pressure
Merkel’s Disk senses…
sustained pressure
what does Meissner’s corpuscle sense?
vibration/flutter
Pain serves to inform and to warn us of ________ to
our bodies.
damage
true or false: Pain serves to inform and to warn us of damage to our bodies
true
what do Pacinian and Meissner corpuscles, Merkel’s disks and Ruffini have in common?
they all have ion channels
pacinian corpuscles have ____ ______ receptor fields than Meissner’s corpuscles
much larger
other receptors ensure that you can feel things ____ your ______ ____
over your entire body
when a stimulus is detected, the receptors send impulses along the _______ ______
sensory nerves
true or false? The axons connecting touch receptors to the spinal cord are large myelinated fibres that convey information from the periphery towards the cerebral cortex extremely rapidly.
true
what are cold, warmth and pain or detected by?
thin axons with “naked” endings
true or false? Temperature
receptors also show adaptation.
true
where is the somatosensory cortex located?
post central gyrus
true or false: The input from the body is not systematically “mapped” across the somatosensory cortex to form a representation of the
body surface.
false
what is the sensory homunculus?
the map of the body, according to the brain
The ability to perceive fine detail varies greatly across
different parts of the body and is most highly developed in _________ and ___.
fingertips and lips
skin is sensitive enough to measure a dot that is less than ___ of a millimetre high - like braille
1/100
is touch just a passive sense that responds only to what it recieves?
yes!
what do the neurons in the motor cortex control?
muscles in arms and moves fingers
Does cross-talk between sensory and motor systems begins at the first relays in the spinal cord, including proprioceptive feedback on to motor neurons, and it continues on all levels of the somatosensory system.
yep :>
Are the primary sensory and motor cortices beside each other in the brain?
yesh
what is crucial for sense of touch?
active exploration
cortical plasticity is revealed by _______
brain plasticity
what is pain often classed with?
touch
recordings from singel sensory fibres in animals reveal that…
responses to stimuli can cause or threaten tissue damage
definition of nociceptor
pain receptor cell
name two classes of peripheral afferent fibres:
fast myelinated fibres and slow non-myelinated fibres
what are the fast, myelinated fibres called?
Αδ fibres (pronounced as A-Delta)
what are the slow, non-myelinated fibres called?
C fibres.
A second pathway projects to different areas than the somatosensory cortex includes:
anterior cingulate cortex and the insular cortex
we might think a life without pain is great, but not so. give one example of this:
Action potentials in nociceptive nerves entering the
spinal cord initiates automatic protective reflexes, such as the withdrawal reflex – you can’t sense this anymore ig but idek
name a key function of pain:
inhibition
The first such modulatory mechanism to be discovered was the release of _______:
endogenous analgesics.
A number of chemical transmitters are involved including endogenous opioids such as ________.
met-enkaphalin.
what is the phenomenon of enhanced pain called?
hyperalgesia.
