Term
| What motor pathways have relays in the thalamic nuclei? |
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Definition
| Motor pathways from the basal ganglia and cerebellum. |
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Term
| What sensory pathways synapse in the dorsal thalamus? |
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Definition
| All, except some olfactory. |
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Term
| Internal medullary lamina separates what? |
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Definition
| Dorsomedial nucleus and the lateral component of the thalamus. Anteriorly bifurcates to enclose the anterior nuclear group. |
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Term
| What are the dorsal nuclei of the lateral thalamus? |
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Definition
| Lateral dorsal, lateral posterior, and pulvinar nuclei. |
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Term
| What are the ventral nuclei of the lateral thalamus? |
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Definition
| Ventral anterior, ventral lateral, and ventral posterior (medial and lateral). |
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Term
| What is also visible what the anterior nucleus of the thalamus is visible? |
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Definition
| The ventral anterior nucleus first. One section back, the ventral lateral nucleus. |
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Term
| What is also visible when the dorsomedial nucleus is visible? |
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Definition
| The ventral lateral, VPLN, and the VMLN. Also the Intralaminar nuclei (cemtromedian and parafascicular). Also the lateral dorsal nucleus. |
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Term
| What is visible when the pulvinar is visible? |
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Definition
| The medial geniculate and the lateral geniculate nucleus. |
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Term
| Input to the ventral anterior nucleus? |
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Definition
| Motor - primary input from basal ganglia. |
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Term
| Input to the ventral lateral nucleus? |
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Definition
| Motor - from the cerebellum. |
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Term
| Input to the posterolateral nucleus? |
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Definition
| Somatosensory relay nucleus for body: dorsal column, spinal thalamic tracts. |
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Term
| Inputs to ventral posteromedial nucleus? |
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Definition
| Somatosensory relay nucleus for head: trigeminothalamic tract. |
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Term
| Inputs to the lateral geniculate nucleus? |
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Definition
| Visual input from the optic tract i processed in the lateral geniculate nucleus. |
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Term
| Input to the medial geniculate nucleus? |
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Definition
| Auditory input from brachium of the inferior colliculus processed in the medial geniculate nucleus. |
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Term
| Inut to lateral dorsal nucleus? |
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Definition
| Linked with anterior nuclei. |
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Term
| Input to lateral posterior nucleus? |
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Definition
| Linked with the pulvinar. |
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Term
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Definition
| Unkown. May be involved in "secondary" visual system. |
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Term
| Tracts to the dorsomedial nucleus? |
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Definition
| Input from limbic structures such as the amygdala projects to prefrontal cortex. |
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Term
| Input to the centromedian and parafascicular nuclei? |
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Definition
| Input from basal ganglia, cerebral cortex, cerebellum, collaterals of the spinothalamic, spinoreticulothalamic. Projections then go to different places (e.g. basal ganglia). |
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Term
| Inputs to the Reticular Nucleus? |
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Definition
| Collaterals from the thalamocortical and corticothalamic fibers. Contain GABAergic neurons that project to the thalamic nucleus. Modulcates thalamic forwarding to the cortex (along with reticular projections). |
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Term
| Carona radiata and internal capsule: input or output fibers, or both? |
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Definition
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Term
| The crus cerebri is an extension of? |
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Definition
| The internal capsule. Bundle of fibers between the lenticular nucleus and the thalamus and the head of the caudate. |
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Term
| What type of fibers are found in the internal capsule? |
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Definition
| Thalamocortical, corticothalamic, and all descending fibers to the brainstem and spinal cord. |
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Term
| What are the five parts of the internal capsule? |
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Definition
| Anterior limb, genu, posterior limb, sublenticular, retrolenticular. |
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Term
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Definition
Posterior thalamic lesion.
Abnormal sensations. Intense pain triggered by somatosensory stimulation.
May involve one half of the body.
Resistant to drug tx
Other stimuli may be abnormal in intensity or modality - pleasant or unpleasant.
May be a dissociation between fast and slow pain systems (VPL, VPM vs IL). |
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Term
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Definition
Thalamic pain
Hemianesthesia - contralateral.
Sensory ataxia - loss of proprioception.
May have paralysis due to internal capsule damage.
May have involuntary movements due to BG damage. |
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