E3 basal ganglia

Question 1

direct pathway

Answer 1

disinhibits VA and PPN to promote initiation/synergies and inhibit posture

Question 2

indirect pathway

Answer 2

inhibits VA and PPN to inhibit initation/synergies

facilitates posture

Question 3

should draw overall path

Answer 3

d

Question 4

parkinsons disorder

Answer 4

damage to dopaminergic SNc
underactive direct pathway
leading to over inhibited VA
overactive indirect pathway 
further inhibits VA
difficulty with initiation and other things

Question 5

huntington chorea

Answer 5

damage to indirect part of striatum
underactive indirect path
leading to overactive VA
involuntary movements
later gaba cells degererate in direct path underactivity
initiation problems

Question 6

hemiballismus

Answer 6

damage to subthalamic nucleus
decrease in GPi and SNr activity so overactivity of VA thalamus
contralateal