NSCI 324 Lecture Notes - Lecture 6: Reticular Formation, Superior Colliculus, Rubrospinal Tract
27 Feb 2017
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Deep tendon reflex: monosynaptic excitation agonist, disynaptic inhibition of agonist. Reduction in this reflex means spinal injury. Inhibitory interneuron: synapse onto motor neurons of antagonists, turn off antagonist muscles (e. g corrective response when you slip) Jendraasik maneuver: tendon reflex in leg will become accentuates when clenching teeth etc. Turn on one art of motor system, changes reflex at another part. Gtos provide inhibitory feedback to agonists and excitation to antagonists. When a muscle generates force, this feedback will tend to reduce force output. Painful stimuli (stand on nail, want to get off really fast) Neurons go to muscle and cross over to influence neurons on the other leg. Muscles to help foot off will be activated, turn off muscles pushing down (flexor reflex) Turn on other leg muscles to take on the load, extensors turned on, inhibit flexors (crossed extensor reflex) Central pattern generator (cpg) in spinal cord generate flexor and extensor pattern of leg muscle activity.
