Tag: Corticospinal tract

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84. Decussations [X]

  1. The lateral corticospinal tracts decussate in the pyramids of the lower medulla. (T/F?)
  2. The posterior spinocerebellar tracts   decussate one to two levels above their entry points in the spinal cord.  (T/F?)
  3. The fibers of the anterior corticospinal tract decussate in the pyramids of the lower medulla. (T/F?)
  4. The lateral spinothalamic tracts decussate in the lower medulla. (T/F?)
  5. The anterior spinocerebellar tracts do not decussate. (T/F?)
  6. The dorsal column tracts decussate in the lower medulla. (T/F?)

  1. T
  2. F
  3. F
  4. F
  5. F
  6. T

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73. Descending neural pathways

  1. The posterior funiculus contains two descending tracts: the interfascicular fasciculus and the septomarginal fasciculus. /T/F?)
  2. The lateral corticospinal tract is organized somatotopically,  cervical segments are located laterally and sacral segments medialy.  (T/F?)
  3. The rubrospinal tract is situated in the lateral funiculus of the spinal cord. (T/F?)
  4. The lateral vestibulospinal tract runs the entire length of the spinal cord. (T/F?)
  5. The medial vestibulospinal tract runs down only to the cervical segments of the spinal cord. (T/F?)
  6. Spinospinal tracts are collections of fibers that connect various levels of the spinal cord and they are present in all spinal funiculi (posterior, lateral and anterior). (T/F?)

  1. T
  2. F
  3. T
  4. T
  5. T
  6. T

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23. Corticospinal tract

  1. The corticospinal tract is a motor pathway starting at the cortex that terminates on motor neurons in the brainstem or spinal cord and is involved in the control of motor functions of the body?
  2. About 80% of corticospinal neurons originate in the primary motor cortex?
  3. Pyramidal cells of Betz are the largest neurons in the central nervous system?
  4. Lateral corticospinal tract appears on transverse section of the spinal cord as an oval area in front of the posterior column and medial to the posterior spinocerebellar tract?
  5. All the fibers of the lateral corticospinal tract cross the midline in the medulla oblongata and control the limbs and digits?
  6. The anterior corticospinal tract becomes smaller as it descends, ending at the level of the mid-thoracic spinal cord?

  1. F
  2. F
  3. T
  4. T
  5. F
  6. T