BIO 208 Lecture Notes - Lecture 8: Automatic Control, Genetic Predisposition, Muscle Spindle
19 Sep 2016
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Document Summary
Moving the joints:requires coordinated action of flexor and extensor muscles at that joint: activate muscles in a specific manner, cause joint to either flex or extend, joints moved by reciprocal muscle action (not random) on joints: Joints are moved by reciprocal action of muscles- flexors and extensors. Nervous system is wired to facilitate this. Stretch reflex results in contraction of the stretched muscle and relaxation of antagonist. This is referred to as the reciprocal innervation pattern. Flexor reflex results in limb withdrawal via excitation of flexors and inhibition of extensors. Muscle structure: a muscle contains many muscle fibers that each receive innervation from the spinal cord. Segmental organization of the innervation of the body musculature. Activation of muscle fibers by motor neurons: strong synapses so each action potential in the motor axon results in an action potential in the muscle fiber on which it synapses (diff from cns that are weaker)
