Reflex%20Arc

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Reflex Arc

• Its a neural pathway that mediates in a reflex
  action.
• The sensory neurons pass through the spinal cord
  which allows reflex actions to occur relatively
  quickly by activating spinal motor neurons
  without the delay of steering signals through the
  brain, although the brain will receive sensory
  input while the reflex action occurs.

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Reflex Arc

• Monosynaptic- When a reflex arc consists of only
  two neurons in an animal ,one sensory neuron and
  one motor neuron. It refers to the presence of a
  single chemical synapse. In the case of
  peripheral muscle reflexes brief stimulation to
  the muscle spindle results in contraction of the
  agonist muscle.
• Polysynaptic- Reflex pathways, one or more
  interneurons connect afferent/sensory and
  efferent/motor signals. All but the most simple
  reflexes are polysynaptic, allowing processing of
  polysynaptic reflexes within the spinal cord.

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