Comparing Latency Periods And Amplitude Periods

805 WordsSep 19, 20164 Pages
COMPARISON OF LATENCY PERIOD AND AMPLITUDE OF TWO SIMPLE SPINAL REFLEX PATHWAYS AND THE INFLUENCE OF THE JENDRASSIK MANEUVER ON EACH RESPONSE Jacob Simmons, Adam Middleton, Hamilton Moore, Max Smith, Trey Dickinson University of Mississippi, Dept. of Biology, University, MS. 38677 A simple spinal reflex is a reflex—involuntary, graded, patterned response to a stimulus—that is produced via a single synapse between sensory axons and motor neurons and confined to the spinal cord. In this experiment, two simple spinal reflexes—the myotactic reflex and the H-reflex—were stimulated. We compared a) the latency period—the amount of time between a stimulus and the effector response— and the amplitude—magnitude of an electrical signal—of each reflex; then, b) the effect of the Jendrassik Maneuver (JM) upon the latency period and amplitude of each respective reflex. For the myotactic response, a mechanical stimulus, a sharp strike of the patellar tendon, was utilized to elicit a signal in stretch receptors; however, to trigger the H-reflex, an electrical impulse was applied. These reflexes originate from an action potential produced by a sensory neuron when a stimulus is applied. Sensory neurons transmit the action potentials to an integrating center—the spinal cord—where a response is determined. Then, this response is taken back to the effector organ via motor neurons. The reflex occurs while the brain is becoming aware of the stimulus. Furthermore, the myotactic reflex is
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