Category: Sensory pathways

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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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72. Sensory pathways (II)

  1. The thalamus  contains the second order neurons of the sensory pathways.  (T/F?)
  2. The cuneate fasciculus (fasciculus cuneatus) is located in the posterior white column of the spinal cord and carries information from the lower limbs. (T/F?)
  3. The posterior and anterior spinocerebellar tracts and the lateral spinothalamic tract are located in the lateral funiculus of the spinal cord. (T/F?)
  4. The spinocerebellar tracts carry unconscious proprioception from the whole  body to the cerebellum. (T/F?)
  5. The anterior spinothalamic tract and the spino-olivary tract are located in the anterior funiculus. (T/F?)
  6. The spino-olivary tract carries proprioception information from muscles and tendons to the olive. (T/F?)

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

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69. Neurons and nuclei in the spinal cord

  1. Onuf’s nucleus is located in Rexed’s lamina IX of the sacral region of the spinal cord and supplies the perineal muscles and the anal and urethral sphincters. (T/F?)
  2. The posteromarginal nucleus and the substantia gelatinosa are structures in the spinal cord where first order neurons of the spinothalamic tract synapse. (T/F?)
  3. Onuf’s nucleus is the origin of the  preganglionic parasympathetic fibers. (T/F?)
  4. The intermediolateral nucleus of the spinal cord contains all the preganglionic neurons of the sympathetic autonomic system of the body. (T/F?)
  5. Onuf’s nucleus is sexually dimorphic, males have more motoneurons in them than females. (T/F?)
  6. Neurons of the Clarke’s columns give rise to the spinothalamic tract. (T/F?)

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

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48. Sensory pathways (I)

  1. First-order sensory neurons from the limbs and trunk have their cell bodies in the substantia gelatinosa of the spinal cord. (T/F)
  2. Lateral spinothalamic tract conveys sensations of  touch and pressure. (T/F)
  3. Anterior spinothalamic tract conveys sensations of  pain and temperature. (T/F)
  4. Gracile nuclei are located lateraly to the cuneate nuclei.  (T/F)
  5. Second-order sensory neurons with cell bodies in the gracile and cuneate nuclei cross the midline and ascend in the thalamic radiation. (T/F)
  6. Third-order sensory neurons project from the thalamus to contralateral cerebral cortex. (T/F)

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