Somatosenses Chapter 7 (Exam 3) Flashcards
The ___ provide information relating to
events on the skin and to events occurring within
the body
somatosenses
Three different sensations are reported to the brain
by receptors localized within skin
1) Touch involves perception of pressure and vibration of
an object on the skin (everything but free nerve endings)
2) Temperature is detected by warmth and cold receptors
* Receptor activation is relative to the baseline temperature
* The receptors lie at different levels of the skin (cold are close
to the surface of the skin)
3) Pain is associated with skin tissue damage
These types of adaptors respond with a burst of firing and, within
milliseconds, return to baseline
Rapid Adaptors (Phasic)
These types of adaptors respond with a burst of firing, and then slowly
return to just-above baseline firing rates
Slow adaptors (Tonic)
That is, once stimulation becomes _____ . . . adaptors cease firing
constant
– When you apply shearing force onto skin, they
fire. If you hold it there, they stop.
Detected by free nerve endings known as ____
* Coolness receptors are ___ to the skin; Warmth receptors are ____
thermal receptors, close, located farther
beneath the surface
Pain reception is accurately/poorly localized (as is temperature)
poorly
Receptors for pain (____, a specific type of free
nerve ending with high AP thresholds)
nociceptors
Pain receptors are found in:
- Skin
- Sheath around muscles, internal organs
- Cornea of the eye
- Pulp of the teeth
Are pain receptors found in the brain?
No
The ____ carry information related to touch
(precisely/poorly localized)
dorsal columns , precisely
The ____ carries pain and temperature signals
(precisely/poorly localized)
spinothalamic tract, poorly
The Somatosensory cortex is organized into
columns
Pain and temperature cross over at the ____!
level of the spinal cord
Touch and kinesthesia cross over at the ____!
medulla
Why do we crave salt?
Salt replenishes our ions, Acetylcholine
This type of papillae
– Anterior 2/3 of tongue
– Also has touch, temperature, pressure receptors
– Predominantly sweet receptors
Fungiform Papillae
This type of papillae
– Towards the back of the tongue
– Primarily sour and salty
Foliate Papillae
This type of papillae
– Inverted V on back of tongue
– Predominantly bitter
Circumvallate Papillae
Taste molecules ___ with a ____, alter ___ ___, and induce __ ___
bind, receptor, membrane potential, receptor potentials
It takes sweet a really long/short time to reach your brain
long
NB: if its safe not as urgent to need to know that it may possibly be dangerous
How long is the lifespan of a tastebud?
10 days
Gustatory information is transmitted through these 3 things and what are there corresponding numbers
cranial nerves (anterior tongue #7) -> posterior tongue#9, and #10(palate and epiglottis)
Relay station for taste information is
the nucleus of the solitary tract (medulla)
