pulvinar


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Related to pulvinar: pulvinar sign

pulvinar

 [pul-vi´nar]
the prominent, cushionlike mass of nuclei that forms the medial portion of the posterior extremity of the thalamus, which partly overhangs the rostral colliculus and its brachium and is separated inferiorly from the geniculate body by the brachium of the rostral colliculus; it receives fibers from other thalamic nuclei and gives off widespread cortical projections.

pul·vi·nar

(pŭl-vī'năr),
The expanded caudal extremity of the thalamus that forms a cushionlike prominence overlying the geniculate bodies. This structure, collectively called nuclei pulvinares [TA] (pulvinar nuclei [TA]), is a composite cell group made up of anterior, inferior, lateral, and medial nuclei.
[L. a couch made from cushions, fr. pulvinus, cushion]

pul·vi·nar

(pŭl'vī-năr) [TA]
The expanded posterior extremity of the thalamus that forms a cushionlike prominence overlying the geniculate bodies.
[L. a couch made from cushions, fr. pulvinus, cushion]

pulvinar 

The prominence of the posterior portion of the thalamus overlapping the superior colliculus. It receives projections from the auditory, somatosensory and visual cortex regions. It is involved in visual attention, suppression of irrelevant stimuli and utilizing information to initiate eye movements.
References in periodicals archive ?
We note that these functional circuits included several subregions in the thalamus, such as the ventral posterior lateral nucleus, the pulvinar, and the medial dorsal nucleus.
The pulvinar sign has diagnostic value for vCJD, but studies have also reported it in sCJD cases where it was accompanied by signal changes in other regions of the brain (13,14).
The magno-cellular dorsal stream eventually ends in the parietal cortex later than the superior colliculus/ pulvinar pathway, to answer the question "where is it?" helping the individual to identify where an object is in space (ie, integration of all the body's attention and range-finding systems, aligning the eyes, head and body with convergence and accommodation, to accurately fixate the object of regard);this can be considered to be a reflex arc pathway which Skeffington labelled as the "centring system" (Figure 3).
Diagnosing variant Creurzfeldt-Jakob disease with the pulvinar sign: MR imaging findings in 86 neuropathologically confirmed cases.
A prominent, symmet rical pulvinar high signal on T2-weighted and/or proton-density-weighted MRI has been reported in most vCJD patients (9).
The temporal thalamic cluster (dark blue) included mainly the MGN but also the pulvinar, which projects to occipital, parietal, and temporal areas.
One patient had florid plaques and a pulvinar sign on magnetic resonance imaging, mimicking vCJD (5).
An electroencephalogram evaluation showed no abnormalities, but a brain magnetic resonance imaging (MRI) study showed the characteristic signal abnormalities in the pulvinar and metathalamic regions suggestive of vCJD.
For example, the auditory signals can first feed forward to the A1 for initial processing, and then feed back to the MGN and multimodal thalamic nuclei (e.g., the pulvinar) [177], and finally project to the V1 (cortico-thalamooccipital pathway).
The most seriously affected thalamic nuclei are the anteroventral, mediodorsal nuclei, and pulvinar.[34],[35]
Electrical stimulation of the face patches can activate the amygdala, claustrum, and pulvinar, (31) suggesting that these subcortical structures may also play a role in face processing.
Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.