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Flashcards in Basal Ganglia Deck (21)
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1

Caudate nucleus + putamen

Striatum (striped appearance)

2

Nucleus accumbens alternate name

Ventral striatum

3

Putamen + globus pallidus

Lentiform nucleus

4

What is the ansa lenticularis

Outflow from globus pallidus; GABA-ergic projection to thalamus

5

What type of project (ex/in) is the Striatum to the GPi?

Inhbitory

6

What receptors on the Striatum do SN DA bind in the direct pathway?

D1 (excitatory)

7

What is the role of the STN in the indirect pathway

Excites the inhibitory neuron from the GPi  to the thalamus, resulting in more inhibition

- STN to GPi = subthalmic fasciculus

-GPi to thalamus = ansa lenticularis

8

Which DA receptors do SN DA bind in the indirect pathway

D2; inhibits excitatory interneuron; reduces the activity of the STN (cortical input increases excitatory interneuron simultaneously, increasing STN activity)

9

Goal of indirect pathway

Inhibit competing movements

10

Goal of direct pathway

Facilitate target-oriented movements

11

Describe blood supply to basal ganglia

12

Nucleus accumbens is the fusion of ___

Head of caudate and putamen

13

Where is the Substantia nigra located

Rostral midbrain -- dark appearance

14

Which 2 fibre tracts form the thalamic fasciculus?

1) lenticular fasciculus and ansa lenticularis (GPi)

15


Which fibres travel in the subthalamic fasciculus


1) inhibitory projections from GPe to STN; excitatory projections from STN to GPi

16

The anterior choroidal arteries branch off of which main artery?

Internal carotid  (along with MCA)

17

Which BG structures are supplied by anterior choroidal artery?

1) Tail of caudate; 2) Posterior portions of GP and Putamen

18

Which BG structures are supplied by the ACA

Branches penetrate to head of the caudate and anterior part of Putamen and GP (opposite of anterior choroidal arteries)

19

Which BG structures are supplied by the MCA?

Branches supply putamen and globus pallidus (middle portions) and the BODY of the caudate nucleus

20

Which BG structures are supplied by the PCA and posterior communicating artery?

Entire thalamus (deep branches); SN, STN, posterior caudate

21