List and describe the basic steps involved in producing movement, beginning with the upper motor neurons in the cerebral cortex.

Video transcript

Hey, everyone. Let's take a look at this question together. The decoration in the medulla allows for contralateral control. Where is it? Answer choice. A, the movements of multiple muscle groups are synchronized. Answer choice. B the brain's left hemisphere controls the right side of the body and vice versa. Answer choice. C involuntary reflexes are activated in the presence of a stimulus or answer choice. D muscles contract and change in length. Let's work this problem out together to try to figure out which of the following answer choices is where contralateral control occurs thanks to the decussation in the medulla. So in order to solve this question, we have to recall what we have learned about what contralateral control refers to and where contralateral control occurs as a result of the decussation in the medulla. And we can recall that the decoration in the medulla refers to the crossing over of nerve fibers in the corticospinal tract. And the reason why the crossing over of nerve fibers in the corticospinal tract allows for contralateral control is that the motor commands originating from the left hemisphere, control the muscles on the right side of the body and vice versa. Meaning that the motor commands originating from the right hemisphere, control the muscles on the left side of the body. And so the decussation in the medulla allows for that contralateral control. In which answer choice B, the brain's left hemisphere controls the right side of the body and vice versa. So answer choice B is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.