USMLE Step 1 Neuroanatomy Review 27 12 Review of the Spinal Tracts

USMLE Step 1 Neuroanatomy Review 27 12 Review of the Spinal Tracts

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Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.

Play USMLE Audio MP3 27 12 Review of the Spinal Tracts Below

Begin 27 12 Review of the Spinal Tracts Transcription

All right, now we’re going to do a little bit of review on these tracts from the other direction.  I’m going to name a series of functions of a particular tract, and then I want you to name the tract and tell me whether it is an ascending or descending tract.  Okay here we go.

This tract carries tactile sensation, vibration, form recognition, and proprioception.  This is the dorsal column medial lemniscus, an ascending tract.

All right, now this tract carries light touch sensation.  This is the ventral spinothalamic tract, an ascending tract as well.

Which tract is concerned with voluntary muscular activity?

  • This is the lateral corticospinal, or pyramidal tract, and it is a descending tract.

This tract is concerned with the control of flexor tone.  This is the rubrospinal tract, a descending tract.

This tract carries unconscious proprioception to the cerebellum and is involved in fine coordination of position and movements of muscles of the lower extremities.  This is the dorsal spinocerebellar tract, an ascending tract.

Is the dorsal spinocerebellar tract a crossed or uncrossed tract?

  • The dorsal spinocerebellar tract is an uncrossed tract.

This tract is concerned with control of axial muscles.  This is the ventral corticospinal tract, a descending tract.

This tract arises from the contralateral red nucleus of the midbrain.  This is the rubrospinal tract, a descending tract.

This tract is concerned with the control of extensor tone.  This is the vestibulospinal tract, a descending tract.

This tract carries pain and temperature sensation.  This is the lateral spinothalamic tract, an ascending tract.

This tract carries unconscious proprioception to the cerebellum and is involved with coordinated movement and position of the lower extremities.  This is the ventral spinocerebellar tract, an ascending tract.

Is the ventral spinocerebellar tract a crossed or uncrossed tract?

  • The ventral spinocerebellar tract is a crossed tract.

This tract arises from the ipsilateral vestibular nucleus of the giant cells of Deiter’s.  This is the vestibulospinal tract, a descending tract.

This tract carries sympathetic and parasympathetic fibers to the spinal cord.  This is the autonomic tract, a descending tract.

When this tract is transected, the result is spastic hemiparesis.  This is the pyramidal or lateral corticospinal tract, a descending tract.

This tract is concerned with the control of flexor tone.  This is the rubrospinal tract, a descending tract.

This tract is concerned with the control of extensor tone.  This is the vestibulospinal tract, a descending tract.

This tract carries light touch sensation.  This is the ventral spinothalamic tract, an ascending tract.

This tract carries unconscious proprioception to the cerebellum and involved in fine coordination of position and movement of the upper extremity.  This is the cuneocerebellar tract, an ascending tract.

 

****END OF TRANSCRIPTION****

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