Neuro: Thalamus

Question 1

The thalamus is _______ to 3rd ventricle

Answer 1

Adjacent

Question 2

The thalamus is _______ to midbrain

Answer 2

Superior

Question 3

The thalamus is ________ to the head of the caudate nucleus

Answer 3

Caudal

Question 4

The thalamus is _______ to Putamen

Answer 4

Medial/caudal

Question 5

Sensory relay nuclei of Thalamus: synapse in __________ and project to __________

Answer 5

Synapse in thalmic nuclei and project to primary cortex

Question 6

The motor nuclei of the thalamus are a part of the circuitry of what 2 motor coordination systems?

Answer 6

Cerebrocerebellar system

Basal Ganglia system

Question 7

Anterior/medial nuclei of the thalamus are connected to ______________

Answer 7

Prefrontal cortex and limbic regions

Question 8

Intralaminar nuclei of the thalamus are part of the __________________ circuit that maintains ____________

Answer 8

Brainstem-thalamus-cortex circuit that maintains conscious state

Question 9

The reticular nucleus of the thalamus contains ________ neurons

Answer 9

Inhibitory

Question 10

Reticular nucleus prevents ___________ of thalamus

Answer 10

Over-activation

Question 11

Too much inhibition by the Reticular nucleus is thought to be a cause of what condition?

Answer 11

Absence seizures in children

Question 12

Somatosensory nuclei in Thalamus

Answer 12

Ventral posterior medial - Face/Head/Taste

Ventral posterior lateral - Body

Question 13

Visual sensory nuclei in Thalamus

Answer 13

Lateral geniculate nucleus

Question 14

Auditory sensory nuclei in thalamus

Answer 14

Medial Geniculate nucleus

Question 15

Anterior nuclei of Thalamus have an influence on ________________

Answer 15

Working memory function

Question 16

Korsakoff’s syndrome

Answer 16

Infarct or alcoholism-associated degeneration

deficiency of thiamine

Impaired info transfer from working memory to long-term memory

Question 17

Korsakoff’s syndrome is due to a lesion where?

Answer 17

Anterior nucleus of thalamus

Question 18

Mediodorsal nuclei projects to

Answer 18

Prefrontal cortex

Question 19

Mediodorsal nuclei lesions result in what deficits?

Answer 19

Learning/memory impairment

Question 20

Disruption of the reticular activating system will result in __________

Answer 20

Loss of consciousness

Question 21

Sensory Deficit Effects of Unilateral Thalamic Damage

Answer 21

Visual: homonymous hemianopia

Auditory: left MGN damage - only issue with sound localization

Somatosensory: lose one-sided face and body somatosensation

Viscerosensory: VPM - spared due to bilateral sharing

Question 22

Motor Deficit Effects of Unilateral Thalamic Damage

Answer 22

Left VA/VL damage - impairment in motor coordination and fine tuning

Would you see loss of motor strength? No

Question 23

Do Infarcts of the thalamus tend to damage the entire thalamus?

Answer 23

No, only a part of thalamus

Question 24

The thalamus is supplied by vessels that come off the __________

Answer 24

Circle of willis

Question 25

Blood supply to the thalamus

Answer 25

Branches of Posterior Communicating Artery ## Footnote Branches of Posterior Cerebral Artery Anterior choroidal Artery

Question 26

LGN is supplied by the distal part of _____________

Answer 26

Choroidal arteries