Forebrain Dienceph [3]

Question 1

Anterior limb Internal capsule carries fibers to/from where?

Answer 1

carries fibers from anterior nucleus of the thalamus → cingulate gyrus
- relaying hippocampal limbic info

DM → prefrontal cortex
- relaying info about executive fxn and working memory

(NOT including motor cortex)

Question 2

Posterior limb Internal capsule carries fibers to/from where?

Answer 2

Motor cortex → SC and BS

VPL/VPM → Post central gyrus

Question 3

Anterior nucleus of the thalamus receives input from where?

Answer 3

mamillary bodies

Question 4

Anterior commissure connects what?

Answer 4

temporal lobes (by anterior limb of internal capsule)

Question 5

Relay neurons: list their modality
Anterior
VA/VL
VPL/VPM
LGN
MGN

Answer 5

Anterior: limbic, input form mamillary bodies
VA/VL: motor
VPL/VPM: somatosensory
LGN: visual
MGN: auditory

Question 6

System name: thalamic nucleus: ult cortical target

• Visual
• Auditory
• Somatosensory for the face
• somatosensory for the body

Answer 6

• Visual: LGN : visual cortex
• Auditory: MGN : auditory cortex
• Somatosensory for the face: VPM : somatosensory cortex
• somatosensory for the body: VPL : somatosensory cortex

Question 7

Region of capsule: origin and destination

Anterior limb

Answer 7

Anterior nucleus of thalamus → Cingulate gyrus

DM nucleus → Prefrontal cortex

Question 8

Region of capsule: origin and destination

Posterior limb

Answer 8

Motor cortex → spinal cord and brainstem

VPL/VPM → postcentral gyrus

Question 9

Region of capsule: origin and destination

Retrolenticular

Answer 9

Pulvinar → parietal association cortex
- relay visual process info

LGN → Visual cortex

Question 10

Region of capsule: origin and destination

Sublenticular

Answer 10

LGN → Visual cortex
MGN → Auditory cortex

*note: if you see the red nucleus on a coronal sec. it means LGN and MGN are next to it

Question 11

Give the associated thalamic relay neuron and functional significance
BA 1-3:

Answer 11

VPM/VPL

Primary somatosensory

Question 12

Give the associated thalamic relay neuron and functional significance
BA 4

Answer 12

VA/VL

Primary motor

Question 13

Give the associated thalamic relay neuron and functional significance
BA 17

Answer 13

LGN

Primary visual

Question 14

Give the associated thalamic relay neuron and functional significance
BA 41

Answer 14

MGN

Primary auditory

Question 15

Give the functional significance

BA 44-45

Answer 15

Brocas area