Lab 4: Neurophysiology Studied in Humans

Question 1

t-reflex in soleus pathway

Answer 1

tendon tap -> activates stretch receptors -> sensory neurons -> motor neurons in spinal cord -> contraction of soleus

Question 2

what do M and H waves represent

Answer 2

M = signal from direct stimulation of motor neurons
H = signal from stimulation of motor neurons by sensory neurons (via reflex path)

Question 3

as voltage increased, what happened to M and H waves?

Answer 3

M wave increased
H wave increased to a max then decreased
-> bc a bigger stimulus = more direct activation of motor neurons = more in refractory period when they get input from sensory neurons