VIM

Question 1

Target of VIM

Answer 1

Middle of nucleus, 1-2mm anterior to VC border, contact 0 at base of VIM

Tremor arrest

Question 2

Medial VIM

Answer 2

Middle aspect of nucleus

Possible dysarthria and tremor control

Question 3

CM/Pf

Answer 3

Medial to VIM

Centromedian nucleus/ Parafascicular nucelus

No effect, possible effect on tremor

Question 4

Posterior limb of internal capsule

Answer 4

Lateral to VIM

Dysarthria, muscle contractions, facial pulling

Question 5

Vop

Answer 5

Anterior to VIM

Possible reduction in tremor at higher voltages

Ventralis oralis posterior

Question 6

Voa

Answer 6

Anterior to Vop

No effect

Ventralis oralis anterior

Question 7

Vc

Answer 7

Posterior to VIM

Paresthesias that increase with severity with increasing voltage

Ventralis caudalis

Question 8

Dorsal thalamic nucleus

Answer 8

Dorsal

No effect

Question 9

Dorsal Vop/Voa

Answer 9

Dorsal aspect of VIM

Possible impact of tremor at higher voltages

Question 10

Internal capsule

Answer 10

Lateral, ventral and dorsal to VIM

Lateral to STN

Dysarthria, muscle contractions, facial pulling

Question 11

Brachium conjunctivum (cerebellar fibers)

Answer 11

Ventral and medial to VIM

Ataxia

Question 12

Zona Incerta

Answer 12

Ventral to VIM

Superior to STN

Possible impact on tremor and dyskinesis

Question 13

Medial Lemniscal pathway

Answer 13

Ventral and posterior to VIM

Posterior to STN

Paresthesias