Label the following components of the corticospinal tracts with numbers 1 through 6, with 1 being the origin of the tracts and 6 their destination.     

_____Medullary pyramids where most fibers decussate.     

_____Anterior horn of the spinal gray matter.     

_____Midbrain and pons.      

_____Upper motor neurons in the primary motor and premotor cortices.     

_____Corona radiata and internal capsule.        

_____Lateral funiculus of the spinal cord.

Video transcript

Hey, everyone. Let's take a look at this question together the fibers of the corticospinal tracts synapse with lower motor neurons. In what is it? Answer choice. A the medulla oblong aa answer choice B the cerebral peduncles. Answer choice C the interior horn of the spinal cord or answer choice. D the corona radiata. Let's work this problem out together to try to figure out which of the following answer choices is the location where the fibers of the corticospinal tracts synapse with the lower motor neurons. So in order to solve this question, we have to recall what we have learned about the fibers of the corticospinal tracts and how they synapse with the lower motor neurons. And we know that the fibers of the corticospinal tracts after descending through the brain stem and the spinal cord synapse with the lower motor neurons in the anterior horn of the spinal cord. So the horn of the spinal cord, which is part of the gray matter in the spinal cord that contains the cell bodies of those lower motor neurons is the point where the upper motor neurons communicate with the lower motor neurons. So answer choice C anterior horn of the spinal cord is the correct answer and all other answer choices are incorrect. I hope you found this video to be helpful. Thank you and goodbye.