Thalamic Nuclei Flashcards
Anterior part contains
ANTERIOR THALAMIC NUCLEI
part of Papez circuit
Anterior thalamic nuclei
Afferent
Efferent
Afferent: MAMILLOTHALAMIC TRACT involved in limbic system ie emotion and memory
Efferent: to CINGULATE GYRUS (limbic system)
Medial Part cobtains
Dorsomedial nucleus
Dorsomedial nucleus
A
E
Afferent from amygdala
Efferent to PREFRONTAL CORTEX
Dorsomedial nucleus function
Relates emotions to somatic, visceral and olfactory sensation
Lateral part categories
Dorsal tier (limbic system)
Ventral tier
Lateral posterior of dorsal tier
A
E
Receives fibers from the SC
Efferent fibers to parietal lobe
Lateral dorsal of dorsal tier
Efferent fibers to cingulate gyrus there4 a part of limbic system
Pulvinar of dorsal tier
Afferent
Function
Receives information from area 18,19
Functions to integrate vision
Parts of dorsal tier
Lateral posterior
Lateral dorsal
Pulvinar
Parts of ventral tier
- Ventral anterior
- Ventral lateral
- Ventral intermediate
- Ventral posterior
i. Posteromedial
ii. Posterolateral
Ventral anterior
A
E
F(x)
Afferent from GP and substansia nigra
Efferent to area 4 and 6
F(x) to influence motor cortex activity
Ventral lateral
A
E
F(x)
Receives afferent from:
- Cerebellum (contralateral)
- Gp
- Substansia nigra
Efferent: to area 4, 6
F(x) influences motor activity thru the cerebeullum
Ventral lateral nucleus role in treating parkinsosn
EXCISED
Function of ventral posterior
Sensory
Ventral posteromedial
Afferent
Efferent
Receives afferent from trigeminal lemmiscus (solitariothalamic tract for taste)
Efferent to area 3, 1, 2
Ventral posterolateral
A
E
Afferent from the medial and spinal lemniscus
Efferent to primary sensory
Intralaminar nuclei transmits what?
Pain, consciousness, alertness ro cerebral cortex
SPINORERICULAR TRACT ENDS IN RET. FORMATION AND INTRALAMINAR NUCLEI
Midline nuclei is important to
Limbic system
Reticular nucleus location
Lateral to thalamus between the external medullary lamina and internal capsule
Thalamic afferents
Spinal lemniscus
Medial lemniscus
Trigeminal lemniscus
Fibers from caudate, lentiform (gpi)—>GABA
Corticothalamic
Spinothalamic
Efferent from thalamus
Thalamocortica
Dejereine roussy syndrome
Caused by
Effects
Lesion to branches of PCA
Effects Ventral part of Posterior thalamus including internal capsule
Paralysis on opposite side if too much—> exaggerated and spontaneous
