Thalamus and Internal Capsule Flashcards
Thalamus is composed 80% of _____.
Diencephalon (gray matter)
External medullary
lamina:
-Covers _____ surface
-Separates _____ from shell-like reticular nucleus
-Thalamocortical and corticothalamic fibers
lateral; thalamus
Internal medullary
lamina:
-_____ fibers -Divides thalamus into 3 masses:
Interthalamic; Anterior, Lateral, Medial
What are the 2 tracts that uses intralaminar nuclei?
Paleospinothalamic tract and Spinoreticular tract(?)
Reticular nuclei lies between _____ and _____ lamina.
Internal capsule and external medullary lamina
Which nuclei inhibits thalamocortical transmission?
Reticular nuclei
Which nuclei is responsible for arousal from sleep and cortical activation?
Intralaminar nuclei
(T/F) Arousal and pain can both activate intralaminar nucle.
True
Which nuclei uses ARAS (Ascending reticular activating system)?
Intralaminar nuclei
Mediodorsal, Medioventral, and Anterior are all part of which group?
Medial group
Which one of the Medial group is part of behavior responses (prediction and incentives)?
Mediodorsal
Which one of the Medial group is part of behavior (visceral and emotional responses)?
Medioventral
Which one of the Medial group is part of Memory?
Anterior
What group are these part of? – Geniculates – Ventral L – Ventral A – Ventral P
Ventral group of thalamus
Ventral group of thalamus:
Bouts of severe pain
that occurs spontaneously or in response to tactile stimuli. These are symptoms of?
Thalamic syndrome
Lateral Group- which part is in charge of:
• Memory
• Interpretation of
visual stimuli
Lateral dorsal
Lateral Group- which part is in charge of: •Interpretation of visual & other sensory stimuli
•Formulation of complex behavioral responses
Lateral posterior
What are the 3 functional groups of nuclei?
- Specific (relay)
- Association
- Non-specific
What are the parts of Specific (relay) nuclei group?
Anterior, VA,VL,VP and Geniculates
What are the parts of Association nuclei group?
Lateral dorsal, mediodorsal, lateral posterior, and pulvinar
What are the parts of Non-specific nuclei group?
Intralaminar (rostral continuation of reticular formation), and reticular nucleus
_____ of the internal capsule is Bounded by the
lentiform nucleus and head of the caudate nucleus.
Anterior limb
_____ of the internal capsule is Medial to the apex of the lentiform nucleus.
Genu
_____ of the internal capsule is Bounded by the
lentiform nucleus and the thalamus
Posterior limb
_____ of the internal capsule is the Region behind the lentiform nucleus
Retrolentiform
_____ of the internal capsule is the Fibers beneath posterior part of lentiform nucleus
Sublentiform
Thalamic radiations is also known as?
Thalamocortical fibers
Thalamic radiations( Thalamocortical): Fibers to the cerebral cortex coursing in the _____ and corona radiata
internal capsule
_____ thalamic radiation is from mediodorsal thalamic nucleus to prefrontal cortex.
Anterior
_____ thalamic radiation is from ventral posterior thalamic nucleus to parietal lobe; VA/VL thalamic nucleus to frontal lobe.
Superior
_____ thalamic radiation is from lateral geniculate nucleus to occipital lobe; pulvinar to occipital lobe.
Posterior
_____ thalamic radiation is from medial geniculate nucleus to temporal lobe.
Inferior
_____ is the most common site of spontaneous hypertensive hemorrhage in individuals with chronic hypertension.
Internal capsule due to striate arteries.
Anterior thalamic radiation; corticopontine. These are found in what structure of internal capsule?
Anterior limb
Superior thalamic radiation (3rd order DCML), and corticospinal tract are found in what structure of internal capsule?
Posterior limb
Corticobulbar is found in what structure of internal capsule?
Genu
Inferior thalamic radiation (Auditory) is found in what structure of internal capsule?
Sublentiform
Posterior thalamic radiation (Optic radiation) is found in what structure of internal capsule?
Retrolentiform
A stroke in posterior limb of internal capsule will results in?
Contralateral lost of motor neck down, and lost of 2pt touch, vibration, and pressure contralateral neck down.
