Tag: Posterior spinocerebellar tract

Posted on

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

Posted on

13. Afferents to the cerebellum:

  1. The anterior spinocerebellar tract  carries proprioceptive information from muscle spindles and Golgi tendon organs of ipsilateral part of trunk and lower limb and enters the cerebellum through the inferior cerebellar peduncle. (T/F?)
  2. The anterior spinocerebellar tract crosses to the opposite side of the body first in the spinal cord as part of the anterior white commissure and then crosses again and enters the cerebellum via the inferior cerebellar peduncle. (T/F?)
  3. The cuneocerebellar tract enters the cerebellum via the inferior cerebellar peduncle on the opposite side. (T/F?)
  4. Tectocerebellar fibers enter the cerebellum via the middle peduncle from the ipsilateral midbrain colliculi. (T/F?)
  5. The pontocerebellar tract from the  ipsilateral  brainstem enters through the middle peduncle. (T/F?)
  6. Trigeminocerebellar fibers enter through the middle peduncle. (T/F?)

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

  1. The anterior or ventral spinocerebellar tract enters the cerebellum through the superior cerebellar peduncle. It crosses side first in the spinal cord as part of the anterior white commissure and then it crosses it again in the cerebellum, so it does carry proprioceptive information from the ipsilateral side of the body.
  2. Yes, it double-crosses side like it is explained but does not enter cerebellum through the inferior cerebellar peduncle
  3. The cuneocerebellar tract enters the cerebellum via the inferior cerebellar peduncle on the same side.
  4. Tectocerebellar fibers enter the cerebellum via the superior peduncle and they origin from the superior and inferior colliculi on both sides.
  5. The pontocerebellar tract from the contralateral  brainstem enters through the middle peduncle.
  6. Trigeminocerebellar fibers enter through the inferior cerebellar peduncle.