Which factor will decrease the activity of muscle spindle afferents?
Answer (not E)
A. contraction of extrafusal muscle fibers.
B. passive stretch of the muscle.
C. contraction of intrafusal muscle fibers.
D. activation of gamma-motoneurons
E. contraction of the antagonist muscle
How does the 'gate control' mechanism of pain sensitivity operate?
A. Due to extensive convergence on spinal neurons, nociceptor signals from one area are
confused with pain inputs from another area.
B. Low-threshold mechanoceptor afferents activate interneurons, in the substantia
gelatinosa, that presynaptically inhibit nociceptor afferents.
C. Pain-sensitive neurons in lamina I of the dorsal horn are inhibited by Merkel cell
D. Within the dorsal horn, nociceptor inputs from one region are inhibited by nociceptor
inputs from another region.
E. ' Wide dynamic range' cells in the dorsal horn are inhibited by group C afferent input.
The dorsal column - medial lemniscus tract::
A. transmits sensory input from all types of soma