Forebrain Dienceph [3] Flashcards Preview

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Flashcards in Forebrain Dienceph [3] Deck (15):
1

Anterior limb Internal capsule carries fibers to/from where?

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)

2

Posterior limb Internal capsule carries fibers to/from where?

Motor cortex → SC and BS
VPL/VPM → Post central gyrus

3

Anterior nucleus of the thalamus receives input from where?

mamillary bodies

4

Anterior commissure connects what?

temporal lobes (by anterior limb of internal capsule)

5

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

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

6

System name: thalamic nucleus: ult cortical target
- Visual
- Auditory
- Somatosensory for the face
- somatosensory for the body

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

7

Region of capsule: origin and destination
Anterior limb

Anterior nucleus of thalamus → Cingulate gyrus

DM nucleus → Prefrontal cortex

8

Region of capsule: origin and destination
Posterior limb

Motor cortex → spinal cord and brainstem
VPL/VPM → postcentral gyrus

9

Region of capsule: origin and destination
Retrolenticular

Pulvinar → parietal association cortex
- relay visual process info

LGN → Visual cortex

10

Region of capsule: origin and destination
Sublenticular

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

11

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

VPM/VPL
Primary somatosensory

12

Give the associated thalamic relay neuron and functional significance
BA 4

VA/VL
Primary motor

13

Give the associated thalamic relay neuron and functional significance
BA 17

LGN

Primary visual

14

Give the associated thalamic relay neuron and functional significance
BA 41

MGN

Primary auditory

15

Give the functional significance
BA 44-45

Brocas area