stretch reflex part use, examples, types

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2. The stretch (myotatic) reflex is exemplified by the knee jerk
reflex
used routinely in clinical neurophysiology as a tool for
diagnosis of certain neurological condition
The stretch reflex has only one synapse betweenThe
sensory afferent nerves (group Ia afferents)and the motor
efferent nerves (α moroneurons).

3.  When the muscle is stretched, group Ia afferent
fibers in the muscle spindle are activated and
their firing rate increase
The group Ia afferents enter the spinal cord and
synapse directly on and activate α motoneurons.
 When these α motoneurons are activated, they
cause contraction of the muscle that was
originally stretched

4. When the muscle contracts, it shortens, thereby
decreasing stretch on the muscle spindle.
The muscle spindle returns to its original length,
and the firing rate of the group Ia afferents
returns to baseline
Simultaneously, information is sent from the
spinal cord to cause contraction of synergistic
muscles and relaxation of antagonistic muscles.