Basal Ganglia 02

Topic: Anatomy

Created on Sunday, September 9 2007 by jdmiles

Last modified on Sunday, September 9 2007.

 
        A) Onuf's nucleus
 
        B) Internal segment of the globus pallidus
 
        C) Caudate and external segment of globus pallidus
 
        D) Caudate and subthalamic nucleus
 
        E) Substantia nigra pars reticulata
 

 

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This question was created on September 09, 2007 by jdmiles.
This question was last modified on September 09, 2007.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) Onuf's nucleus

This answer is incorrect.

The cortex sends inputs to the basal ganglia primarily through the caudate and putamen.  Neurons in these nuclei synapse with neurons in the internal and external segments of the globus pallidus.  The external segment of the globus pallidus sends outputs to the internal segment of the globus pallidus and to the subthalamic nucleus, which feeds back to the internal segment of the globus pallidus.  The internal segment of the globus pallidus provides output to the thalamus.  Onuf's nucleus is in the spinal cord and is not a part of the basal ganglia.  (See References)

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B) Internal segment of the globus pallidus

This answer is correct.

The cortex sends inputs to the basal ganglia primarily through the caudate and putamen.  Neurons in these nuclei synapse with neurons in the internal and external segments of the globus pallidus.  The external segment of the globus pallidus sends outputs to the internal segment of the globus pallidus and to the subthalamic nucleus, which feeds back to the internal segment of the globus pallidus.  The internal segment of the globus pallidus provides output to the thalamus.  (See References)

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C) Caudate and external segment of globus pallidus

This answer is incorrect.

The cortex sends inputs to the basal ganglia primarily through the caudate and putamen.  Neurons in these nuclei synapse with neurons in the internal and external segments of the globus pallidus.  The external segment of the globus pallidus sends outputs to the internal segment of the globus pallidus and to the subthalamic nucleus, which feeds back to the internal segment of the globus pallidus.  The internal segment of the globus pallidus provides output to the thalamus.  (See References)

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D) Caudate and subthalamic nucleus

This answer is incorrect.

The cortex sends inputs to the basal ganglia primarily through the caudate and putamen.  Neurons in these nuclei synapse with neurons in the internal and external segments of the globus pallidus.  The external segment of the globus pallidus sends outputs to the internal segment of the globus pallidus and to the subthalamic nucleus, which feeds back to the internal segment of the globus pallidus.  The internal segment of the globus pallidus provides output to the thalamus.  (See References)

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E) Substantia nigra pars reticulata

This answer is incorrect.

The cortex sends inputs to the basal ganglia primarily through the caudate and putamen.  Neurons in these nuclei synapse with neurons in the internal and external segments of the globus pallidus.  The external segment of the globus pallidus sends outputs to the internal segment of the globus pallidus and to the subthalamic nucleus, which feeds back to the internal segment of the globus pallidus.  The internal segment of the globus pallidus provides output to the thalamus.  (See References)

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References:

1. Nolte, J. (1993). The Human Brain: An Introduction to Its Functional Anatomy. Mosby, St. Louis.
2. Kandel, E.R., Schwartz, J.H., and Jessel, T.M. (2000). Principles of Neural Science, 4th ed. McGraw-Hill, New York.

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anatomy
Basal Ganglia 02
Question ID: 090907109
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 09/09/2007
Modified: 09/09/2007
Estimated Permutations: 2457000