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Specific sensory stimuli evoke characteristics motor responses very rapidly because few synapses are involved.
What determines the speed of motor response?
The number of synapses to be crossed between the afferent flow of impulses and the activation of efferent nerves
(knee-jerk reflex) the simplest reflex requires only one synapse between sensory and motor neurons.
If you are unable to elicit a response from your patient you can have them try several things. What are they
1) Have them grip their hands together and try to pull apart
2) Have them count backwards from 100 by
7's out loud
3) Have them clench their teeth together really hard
4) Have them say the alphabet backwards out loud
1) free nerve endings
2) Merkel's Discs
3) Ruffini Corpuscles
4) Meissner's Corpuscles
5) Pacinian Corpuscles
How is the density of touch receptors tested?
By using the test-point threshold test.
A calipers w/2 points is applied w/equal pressure to the skin. Subject is asked if 2 distinct points can be felt. The caliper points are moved closer together and the subject retested until only 1 point can be felt
ability of our sensory receptors to respond strongly to acute changes and then stop responding when these stimuli become constant
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