Sensory system - Somatosensory system
18 important questions on Sensory system - Somatosensory system
What receptors are linked to the somatosensory system?
Receptors related to motor system (proprioception)
Receptors related to the rest (entero/interoception)
What are examples of skin receptors/exteroception?
Temperature receptors
Nociceptors = damage sensor, not pain
What are examples of motor system receptors (proprioception)?
- Muscle spindle
- Golgi tendon organ
- Stretch sensors in/around joints
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What are examples of enteroception/interoception receptors?
o Temperature receptors
o Nociceptors
--> feed mainly to the autonomic system, but somatosensory awareness when in trouble
What is characteristic of thermoreceptors?
- Cold and warmth fibers
There are two types of afferent axons of the nociceptors, which two?
- Sharp intense pain, usually short lasting
- Important for the withdrawal reflex
2. C-fibers: slow pain
- Dull burning pain
- This is the pain you dread
There are two separate ascending systems of the
somatosensory system. Which two?
What is the gnostic system (somatosensory system)?
What is the vital system (somatosensory system)?
this system keeps you alive
What are similarities between the vital and gnostic somatosensory system?
- secondary relay neuron in spinal cord or brainstem
- tertiary relay neuron in thalamus
What are differences between the vital and gnostic somatosensory system?
- gnostic = caudal brainstem
- vital = dorsal horn all along spinal cord
- decussation occurs at different levels
- gnostic = decussation "en masse" in caudal brainstem (ipsilateral)
- vital = decussation all along spinal cord (controlateral)
Which axons pass through the dorsal fascicle of the white matter in the spinal cord?
-> medial lemniscal pathway
We can also feel with our head, so this gnostic system also need to be attached to the thalamus. Which lemniscus does this?
What is the function of the substantia gelatinosa and nucleus proprius (layer II and layer III of grey matter)?
What is the the gate control theory of Melzack and Wall?
What is characteristic for large diameter fibers?
What is characteristic for small diameter fibers?
Also for the vital somatosenroy tract another route from the face to the thalamus exist. How is this tract called?
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