<P> When a reflex arc in an animal consists of only one sensory neuron and one motor neuron , it is defined as monosynaptic , referring to the presence of a single chemical synapse . In the case of peripheral muscle reflexes ( patellar reflex , achilles reflex ) , brief stimulation to the muscle spindle results in contraction of the agonist or effector muscle . By contrast , in polysynaptic reflex pathways , one or more interneurons connect afferent ( sensory ) and efferent ( motor ) signals . All but the most simple reflexes are polysynaptic , allowing processing or inhibition of polysynaptic reflexes within the brain . </P>
<P> When a reflex arc in an animal consists of only one sensory neuron and one motor neuron , it is defined as monosynaptic , referring to the presence of a single chemical synapse . In the case of peripheral muscle reflexes ( patellar reflex , achilles reflex ) , brief stimulation to the muscle spindle results in contraction of the agonist or effector muscle . By contrast , in polysynaptic reflex pathways , one or more interneurons connect afferent ( sensory ) and efferent ( motor ) signals . All but the most simple reflexes are polysynaptic , allowing processing or inhibition of polysynaptic reflexes within the brain . </P>
which type of neuron does the sensory neuron synapse with in a monosynaptic reflex
which type of neuron does the sensory neuron synapse with in a monosynaptic reflex
motor neuron
motor neuron