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Terms in this set (61)

Stimulus: right foot steps on tack
Receptor: nociceptor in right foot
Afferent Pathway : somatic sensory neuron(s) send action potentials to spinal cord and diverges
Integrator : one collateral activates ascending pathways for sensation and postural adjustment
Also in spinal cord, somatic sensory afferent neuron synapses on somatic motor efferent neuron to the right leg hamstring (the same somatic sensory neuron also synapses on inhibitory interneuron which synapses on somatic motor efferent neuron to the right leg quadriceps)
Also in spinal cord, the same somatic sensory afferent neuron synapses on interneurons that cross to other side of spinal cord and synapse on somatic motor efferent neuron to the left leg quadriceps (and also synapses on inhibitory interneuron which synapses on somatic motor efferent neuron to left leg hamstring)
Efferent Pathway: somatic motor efferent neuron sends action potentials to the right hamstring (also, inhibitory interneuron prevents somatic motor efferent neuron to send action potentials to the right quadriceps )
Also, different somatic motor efferent neuron sends action potentials to the left quadriceps (inhibitory interneuron prevents somatic motor efferent neuron to send action potentials to the left hamstring )
Effector : In right leg, hamstring contract and quadriceps relax-withdrawing the leg away from the painful stimulus. Simultaneously, in left leg, the quadriceps muscle contracts and hamstring relaxes-extending the knee, so that the leg holds the weight of the body.
Response: Withdraw right leg, extend left leg.