PNB 2XB3 Lecture Notes - Lecture 8: Cyclic Adenosine Monophosphate, Pyramidal Cell, Cerebral Cortex
1 May 2016
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On other leg, excitatory interneurons activates alpha motor neurons that go to quadriceps. Releases gaba onto the hamstrings (opposite from the other leg: stretch reflex is the only known monosynaptic reflex in the mammalian nervous system, this reflex is slower than the stretch reflex. Habituation in trial 1, you can see contraction, and then withdrawal (graph slopes downwards: by trial 13 the response is seriously reduced, different from adaptation (decrease in response to nervous system from a constant stimulus) If # of aps per tap declines, hypothesis 1 is supported: experiment: inject current repeatedly through an electrode in the sensory neuron to cause an ap. If motor neuron response declines, hypothesis 2 is supported: experiment: inject current through an electrode into the motor neuron to cause an ap. If contract declines, hypothesis 3 or 4 supported. Hypothesis 2: the sensory neuron releases less glutamate with each ap this is actually what is happening when habituation occurs.
