USMLE Step 1 Neuroanatomy Review 27 11 Spinal Tracts

USMLE Step 1 Neuroanatomy Review 27 11 Spinal Tracts

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Play USMLE Audio MP3 27 11 Spinal Tracts Below

Begin 27 11 Spinal Tracts Transcription

 We’re going to take a look first at the ascending spinal tracts.  Please refer to figure 14.2.

How many ascending tracts are there in the spinal cord? 

  • There are six ascending tracts.

  Student doctor, what are these six ascending tracts in the spinal cord? 

  • First, the dorsal column medial lemniscus, second and third the lateral and ventral spinothalamic tracts, fourth and fifth the dorsal and ventral spinocerebellar tracts, and sixth the cuneocerebellar tract.

 

 Student doctor, what are the sensations carried by the dorsal column medial lemniscus? 

  • The dorsal column medial lemniscus carries tactile sensation, vibration, form recognition, and proprioception.

  And what are the sensations carried on the lateral spinothalamic tract? 

  • The lateral spinothalamic tract carries pain and temperature sensation.

  Student doctor, what are the sensations carried on the ventral spinothalamic tract? 

  • The ventral spinothalamic tract carries light touch sensation.

  Student doctor, what are the sensations carried on the dorsal spinocerebellar tract? 

  • The dorsal spinocerebellar tract carries unconscious proprioception to the cerebellum.

  Now, the dorsal spinocerebellar tract is involved in what function of what muscles of the body?

  •   The dorsal spinocerebellar tract is involved in fine coordination of position and movement of muscles of the lower extremities.

  Is this tract a crossed or uncrossed tract? 

  • It is an uncrossed tract.

  Student doctor, what are the sensations carried on the ventral spinocerebellar tract? 

The ventral spinocerebellar tract carries unconscious proprioception to the cerebellum and is involved in what type of function of what part of the body? 

  • The ventral spinocerebellar tract is involved with coordinated movement and position of the lower extremities. 

  Student doctor, is the ventral spinocerebellar tract a crossed or uncrossed tract? 

  • The ventral spinocerebellar tract is a crossed tract.

Student doctor, what are the sensations carried on the cuneocerebellar tract? 

The cuneocerebellar tract carries unconscious proprioception to the cerebellum and is involved with what function of what part of the body? 

  • The cuneocerebellar tract involved in fine coordination of position and movement of the upper extremities. 

  Now we are going to take a look at descending spinal tracts.  Please refer to figure 14.2.

  How many descending tracts are there? 

  • There are five.

 Student doctor, please name the five descending tracts of the spinal cord.  First and second, the lateral corticospinal and the ventral corticospinal.  Third, the rubrospinal.  Fourth, vestibulospinal, and fifth, descending autonomic tracts.

Student doctor, what is the lateral corticospinal tract concerned with? 

  • The lateral corticospinal tract is concerned with voluntary muscular activity. 

  What is the other name for the lateral corticospinal tract?

  •   The pyramidal tract. 

  What would be the result of a trans-section of the pyramidal or lateral corticospinal tract? 

  • A trans-section of the pyramidal or lateral corticospinal tract results in spastic hemiparesis. 

  Student doctor, what is the ventral corticospinal tract concerned with? 

  • The ventral corticospinal tract is concerned with control of axial muscles. 

  And what is the rubrospinal tract concerned with? 

  • The rubrospinal tract is concerned with control of flexor tone. 

  Where does the rubrospinal tract arise? 

  • The rubrospinal tract arises from the contralateral red nucleus of the midbrain. 

  Student doctor, what is the vestibulospinal tract concerned with? 

  • The vestibulospinal tract is concerned with the control of extensor tone. 

  Where does the vestibulospinal tract arise? 

  • The vestibulospinal tract arises from the ipsilateral vestibular nucleus of the giant cells of Deiter’s. 

  Finally, what do the descending autonomic tracts carry? 

  • The descending autonomic tracts carry both sympathetic and parasympathetic fibers to the spinal cord.

****END OF TRANSCRIPTION****

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