Somatosensory System Flashcards
What is proprioception?
Joint and muscle position in space
What is nociception?
Pain
What is pruriception?
Itch
What are the 3 divisions of the somatosensory system?
Exteroceptive division
Proprioceptive division
Enteroceptive division
Exteroceptive division - what is it?
Registers infromation from the surface of the body
Cutaneous senses
Proprioceptive division - what is it?
Monitors posture, movement
Enteroceptive division - what is it?
Closely related to autonomic function
The 1st/2nd/3rd order neurone is the primary sensory afferent ?
1st order neurone
Which order neurone (1st/2nd/3rd) starts at a peripheral site of the body ?
1st order neurone
Cell body of the 1st order neurone will be located where?
Dorsal root ganglion (innervation of limbs, trunk, posterior head)
OR
Cranial ganglia (innervation of anterior head)
The 2nd order neurone is located in the CNS. True or false?
True
Where is the cell body location of 2nd order neurone?
Dorsal horn of SC or
Brainstem nuclei
Where is the cell body location of 3rd order neurone?
Thalamic nuclei
Light pressure has a low/high action potential frequency ?
Low
What do mechanoreceptors detect?
Touch, pressure, vibration
Low threshold units respond to high intensity stimuli. True or false?
False
- low intensity stimuli