What would happen to the cortical output to motor pathways if the projections from the substantia nigra pars compacta (SNC) that regulate the direct pathway were overactive? A. Decrease B. No change C. Increase What would happen to the cortical output to motor pathways if the internal segment of the globus pallidus (GPi) was overactive? A. Decrease B. No change C. Increase What would happen to the cortical output to motor pathways if the projection from the striatum to the external segment of the globus pallidus (GPe) was underactive? A. Decrease B. No change C. Increase

Anatomy & Physiology
1st Edition
ISBN:9781938168130
Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Chapter14: The Somatic Nervous System
Section: Chapter Questions
Problem 8ILQ: Watch this video (http://openstaxcollege.org/l/motorpathway) to learn more about the descending...
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Regulates
direct.
pathway
SNC
Regulates
indirect
pathway
SNr
Show Transcribed Text
Cortex
++
++
Indirect
pathway
Direct
pathway
Striatum
GPe
+
Subthalamus
GPi
Descending motor
pathways
+ Thalamus
What would happen to the cortical output to motor pathways if the projections from the substantia nigra pars compacta
(SNC) that regulate the direct pathway were overactive?
A. Decrease
B. No change
C. Increase
What would happen to the cortical output to motor pathways if the internal segment of the globus pallidus (GPi) was
overactive?
A. Decrease
B. No change
C. Increase
What would happen to the cortical output to motor pathways if the projection from the striatum to the external segment
of the globus pallidus (GPe) was underactive?
A. Decrease
B. No change
C. Increase
Transcribed Image Text:Regulates direct. pathway SNC Regulates indirect pathway SNr Show Transcribed Text Cortex ++ ++ Indirect pathway Direct pathway Striatum GPe + Subthalamus GPi Descending motor pathways + Thalamus What would happen to the cortical output to motor pathways if the projections from the substantia nigra pars compacta (SNC) that regulate the direct pathway were overactive? A. Decrease B. No change C. Increase What would happen to the cortical output to motor pathways if the internal segment of the globus pallidus (GPi) was overactive? A. Decrease B. No change C. Increase What would happen to the cortical output to motor pathways if the projection from the striatum to the external segment of the globus pallidus (GPe) was underactive? A. Decrease B. No change C. Increase
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ISBN:
9781938168130
Author:
Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:
OpenStax College