212-218. The upper motor neurons of the pyramidal motor pathway have their cell

Question

212-218. The upper motor neurons of the pyramidal motor pathway have their cell bodies in the frontal lobe of the brain and their axon terminals in the gray matter of the spinal cord. Arrange the following structures in correct order to describe the course of the pyramidal motor pathway from the frontal lobe to the spinal cord. Some choices will not be used 212 213 214 215. 216. of the frontal lobe of the cerebral white matter of the basal nuclei of the midbrain of the medulla oblongata of the spinal cord white matter of the spinal cord gray matter A. cerebral peduncles B. ventral horn C. lateral corticospinal tracts D. dorsal columns E. corona radiata F. precentral gyrus G. red nucleus H. pyramids I. tectum J. internal capsule K. dorsal horn 18.

Explanation / Answer

212 F. This is the primary motor area present anterior to the central sulcus.

213. J. It is the aggregate of white matter fibres located at the deeper layer of cerebral hemisphere.

215. A. These are the axons in the mid brain.

216. H. The motor fibres which pass from brain to medulla form two pyramidal tracts in medulla namely corticotubular and corticospinal tracts.

217. C. These fibres are located in the spinal cord white matter.

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