medial geniculate nuclei

(redirected from dorsal nucleus)

medial geniculate nuclei

nerve cells that collectively form a surface elevation, the medial geniculate body; they comprise a ventral principal nucleus [TA], a dorsal nucleus [TA], and a small medial magnocellular nucleus; the cells play a role in the relay of auditory input to the auditory cortex.
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Dorsal nucleus located at 71-77% of pharyngeal length or 13-15% of entire length of body.
Anterior subventral and posterior subventral nuclei well discerable, smaller to dorsal nucleus located in the middle of glandurium.
Only one significant cluster (67 voxels; Talairach coordinates of best voxel: [11, -25, 2]) was found which included the ventral posterior lateral nucleus, the pulvinar, and the medial dorsal nucleus, located in the right thalamus; HR swimmers showed stronger net connections between the thalamus and the whole brain when compared to those in the LR (Figures 1(d) and 1(e)).
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. These subregions are thought to play important roles in multisensory and sensorimotor integrations, for example, integrating different sensory modalities with motor attributes [46].
On the spinal cord of both control animals and animals treated, the specific connections are preferably in surface Rexed laminae I, II, III, VII and dorsal nucleus with [B.sub.2] iodinated [[sup.125]I] HPP-Hoe 140.
1, compare to intact the higher numbers of densely labelled c-Fos positive neurons were observed bilaterally in the dorsal nucleus at 90 minutes after Eurycoma longifolia administration (8 mg/kg, i.p.).
Stimulation within the medial dorsal nucleus of the thalamus and the substantia nigra has shown to increase in BP, HR, and RR [12].
During this measure of executive function, decreases were seen in the cuneus, middle temporal gyrus, inferior parietal lobule, insula, and medial dorsal nucleus of thalamus.
For the anterior part of MD, which is initially situated just caudal and ventral to the anterior ventral nucleus; lateral to the lateral dorsal nucleus; the internal medullar lamina (IML) spreads ventrally, expands over the anterior surface of the MD and then continues posterior as thin dispersed strips on either side of the mammillothalamic tract (MTT).
The ventral nucleus exhibits reflex acoustic activity, whereas the dorsal nucleus processes dynamic and complex auditory stimuli and acts as a central integrator under the inhibitory influence of the ventral nucleus.
It is connected to the limbic system via several nuclei: paratrigeminal (a new integrant of the central pain modulating system), trigeminal subnucleus caudalis, parabrachial, reticular dorsal nucleus, Kolliker-Fuse, locus ceruleus and finally with thalamus, incerta area, hypothalamus (ventro-medial and posterior nucleus), amygdala nucleus, cingulate and insular cortex.
Its soma are found in the vagus' dorsal nucleus and ambiguus nucleus forming an intricate, multiple-level, inter-neuronal network.

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