PHGY 209 Lecture Notes - Lecture 10: Premotor Cortex, Frontal Lobe, Central Sulcus
13 Dec 2017
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Document Summary
Somewhere in the higher centers of the brain you consciously initiate a movement. From the motor cortex there is information going to the spinal cord and information going to middle levels. Every voluntary movement has a lot of involuntary components. You don"t think about 100s of muscles that you have to contract for one single movement. The middle levels and the spinal cord do muscle contractions that you"re not aware of and they make corrections based on sensory information. You don"t notice the action of the middle levels until something goes wrong. Parkinson"s is when there is problem with the basal nuclei. There is two important descending pathway in the spinal cord. Involved in skilled motor movement, especially in the fingers. Somewhere in the frontal cortex there is some activity about you consciously initiating a movement. This happens about 150 milliseconds before the movement occurs. Activity then occurs in the primary motor cortex, sitting in front of the central sulcus.
