USMLE Step 1 Neuroanatomy Review 27 10 The Spinal Cord

USMLE Step 1 Neuroanatomy Review 27 10 The Spinal Cord

 

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Play USMLE Audio MP3 27 10  The Spinal Cord Below

Begin 27 10  The Spinal Cord Transcription

Section fourteen, the spinal cord.

The spinal cord has how many segments?

  • 31.

And the spinal cord gives rise to how many pairs of spinal nerves?

  • 31.

Student doctor, how many pairs of cervical spinal nerves are there?

  • There are eight pairs of cervical nerves.

And how many pairs of thoracic nerves are there?

  • There are twelve pair of thoracic nerve.

How many pairs of lumbar nerves are there?

  • There are five pair of lumbar nerves.

How many pairs of lumbar nerves are there?

  • There are five pair of lumbar nerves.

And how many pairs of sacral nerves?

  • There are five pair of sacral nerves.

And finally, how many pairs of coccygeal nerves are there?

  • There are only one pair of coccygeal nerves.

Spinal nerves contain sensory or motor or both types of fibers?

  • The spinal nerves contain both sensory and motor fibers.

Sensory information is conveyed to the spinal cord through the peripheral nerves into what structure first?

  • Into the dorsal roots.
  • From the roof of the rhombencephalon.

In general terms, what is the cerebellum involved in?

  • It is involved in the planning of movements before they are initiated.

The cerebellum contains a vermis in the middle and two lateral hemispheres. Please refer to figure 12.1.

What is the function of the anterior lobe?

  • The anterior lobe is involved in the regulation of muscle tone as well as coarse movements of the head and the body.

What is another name for the anterior lobe related to its phylogenetic origin?

  • The paleocerebellum.

What is the function of the posterior lobe?

  • The posterior lobe is involved in the coordination of voluntary motor activity.

What is another name for the posterior lobe in terms of its phylogenetic origin?

  • The neocerebellum.

Now, what is the function of the flocculonodular lobe?

  • The flocculonodular lobe is involved in the maintenance of posture and balance.

What is another name for the flocculonodular lobe in terms of its phylogenetic origin?

  • The archicerebellum.

All right, now let’s take a look at cerebellar pathways.

What is the function of the paravermal spinocerebellar pathway?

  • The paravermal spinocerebellar pathway maintains muscle tone and postural control over the dorsal muscle groups.

What is the function of the lateral hemispheric cerebellar pathway?

  • The lateral hemispheric cerebellar pathway is involved in the initiation, planning, and timing of voluntary muscle activity.

 

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