BIOL 306 Lecture Notes - Lecture 17: Reciprocal Inhibition, Stretch Receptor, Brainstem
10 Jan 2019
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In order to have coordinated motor outputs, we need to have: the correct neurons firing, the correct time relationships, the correct extent of activity, complex reflexes. : the crossed extensor reflex that comes from stepping on a tack. Input comes into the spinal cord, activates the flexor of the right leg and, via inhibitory interneurons, inhibits the extensor of the right leg. The input also crosses the midline to activate the extensor of the left leg and inhibit the flexors of the left leg: the right leg comes up, while the left leg straightens to receive. Therefore, we see the following: your weight. 2 theories: chain reflexes (postulated by sherrington): complex movements are series of reflexes. The issue with this theory is that reflexes require an external stimulus, and, as. Donald m. wilson will later prove, stereotyped patterns don"t require sensory information: central pattern generators: pattern activity is generated by circuits within the nervous system.
