Physiology CNS

These are located in the thalamus and coduct impulses to a somatosensory cortex:

• A.

  First-order neurons

• B.

  Second-order neurons

• C.

  Third-order neurons

These cell bodies are in the dorsal horn of the spinal cord (or medullary nuclei) and transmit impulses to the thalamus or cerebellum.

• A.

  First-order neurons

• B.

  Second-order neurons

• C.

  Third-order neurons

These cell bodies are in the ganglion and transmit impulses from the cutaneous receptors and proprioceptors to spinal cord or brain:

• A.

  First-order

• B.

  Second-order

• C.

  Third-order

• D.

  Fourth-order

Transmit pain, temp, coarse touch; sensations difficult to localize.

• A.

  Non- specific ascending pathways

• B.

  Specific Ascending pathways

• C.

  Direct descending

• D.

  Indirect descending

This is the route for fast and fine (precise) movements

• A.

  Non-specific

• B.

  Specific

• C.

  Direct

• D.

  Indirect

Originate mainly with the pyramidal neurons located in the precentral gyri:

• A.

  Non-Specific Asc

• B.

  Specific

• C.

  Direct Desc

• D.

  Indirect Desc

These pathway innervates muscles involved in maintaining balance, posture, coarse limb movement, and head, neck, and eye movements that follow objects in the visual field.

• A.

  Non-specific

• B.

  Specific

• C.

  Direct

• D.

  Indirect

The _______________ tracts convey information about muscle and tendon stretch to cerebellum