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thalamus
thal·a·mus T0139400 (thăl′ə-məs)n. pl. thal·a·mi (-mī′) A large ovoid mass of gray matter situated in the posterior part of the forebrain that relays sensory impulses to the cerebral cortex.
[Latin, inner chamber, from Greek thalamos.]
tha·lam′ic (thə-lăm′ĭk) adj.thalamus (ˈθæləməs) n, pl -mi (-ˌmaɪ) 1. (Anatomy) either of the two contiguous egg-shaped masses of grey matter at the base of the brain2. (Anatomy) both of these masses considered as a functional unit3. (Botany) the receptacle or torus of a flower[C18: from Latin, Greek thalamos inner room; probably related to Greek tholos vault] thalamic adj thaˈlamically advthal•a•mus (ˈθæl ə məs)
n., pl. -mi (-ˌmaɪ) 1. the middle part of the diencephalon of the brain, serving to transmit and integrate sensory impulses. 2. Bot. a receptacle or torus. [1695–1705; < New Latin; Latin: bedroom < Greek thálamos] tha•lam•ic (θəˈlæm ɪk) adj. thal·a·mus (thăl′ə-məs) The part of the brain in vertebrate animals that lies at the rear of the forebrain. It relays sensory information to the cerebral cortex and regulates the perception of touch, pain, and temperature.thalamusA brain structure above the hypothalamus. It sends sensory impulses to the cerebral cortex, links sensations with emotions, and affects consciousness.Thesaurus| Noun | 1. |  thalamus - large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalonneural structure - a structure that is part of the nervous systemgeniculate body - one of four small oval masses that protrude slightly from the underside of the thalamus and function as synaptic centers on the way to the cerebral cortexbetweenbrain, diencephalon, interbrain, thalmencephalon - the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalonsubthalamus - the ventral part of the thalamus |
Translationsthalamus
thalamus (thăl`əməs), mass of nerve cells centrally located in the brainbrain,
the supervisory center of the nervous system in all vertebrates. It also serves as the site of emotions, memory, self-awareness, and thought. Anatomy and Function
..... Click the link for more information. just below the cerebrum and resembling a large egg in size and shape. The thalamus is a routing station for all incoming sensory impulses except those of smell, transmitting them to higher (cerebral) nerve centers. In addition, it connects various brain centers with others. Thus the thalamus is a major integrative complex, enabling sensory stimuli to evoke appropriate physical reactions as well as to affect emotions. With the hypothalamushypothalamus
, an important supervisory center in the brain, rich in ganglia, nerve fibers, and synaptic connections. It is composed of several sections called nuclei, each of which controls a specific function.
..... Click the link for more information. , the thalamus establishes levels of sleep and wakefulness. It is also vital to the neural feedback system controlling brain wave rhythms.Thalamus a conglomerate of the nuclei of gray matter (nerve cells) in the brain, located between the mesencephalon and the cerebral cortex; it is the main part of the diencephalon. The thalamus developed for the first time in bony fish. In ontogenesis it develops from the prosencephalon sac. The thalamus is a nucleus in which afferent nerve impulses coming from all the sense organs (except the olfactory organs) gather. Each type of sensory pathway has its own specific nuclei (lateral group) in which the impulses are transmitted from one nerve cell to another and are transferred to the appropriate zone of the cerebral cortex. Associative nonspecific nuclei (medial group) receive stimuli from specific nuclei of the thalamus and from nonspecific structures of the diencephalon, mesencephalon, and medulla oblongata and transmit them to various subcortical and cortical neurons. The thalamus is involved in primary analysis and synthesis of all stimuli entering the brain from the neuroreceptors. In lower vertebrate animals the thalamus ensures performance of all necessary reflexes; in mammals and man the higher center of integration is the cerebral cortex. Under the thalamus lies the hypothalamus. IU. A. FADEEV thalamus[′thal·ə·məs] (anatomy) Either one of two masses of gray matter located on the sides of the third ventricle and forming part of the lateral wall of that cavity. thalamus, thalamiumIn early Greek architecture, an inner room or chamber, esp. the women’s apartment.thalamus
thalamus [thal´ah-mus] (L.) either of two large ovoid structures (the dorsal thalamus or simply thalamus and the ventral thalamus) composed of gray matter and located at the base of the cerebrum. (See also brain.) adj., adj thalam´ic. The thalamus functions as a relay station in which sensory pathways of the spinal cord and brainstem form synapses on their way to the cerebral cortex. Specific locations in the thalamus are related to specific areas on the body surface and in the cerebral cortex. A sensory impulse from the body surface travels upward to the thalamus, where it is received as a primitive sensation and then is sent on to the cerebral cortex for interpretation as to location, character, and duration. The thalamus has numerous connections to other areas of the brain as well, and these are thought to be important in the integration of cerebral, cerebellar, and brainstem activity.ventral thalamus the subthalamic tegmental region, a transitional region of the diencephalon interposed between the (dorsal) thalamus, the hypothalamus, and the tegmentum of the mesencephalon; it includes the subthalamic nucleus, Forel's fields, and the zona incerta. Called also subthalamus.thal·a·mus, pl. thal·a·mi (thal'ă-mŭs, -mī), [TA] The large, ovoid mass of gray matter that forms the larger dorsal subdivision of the diencephalon; it is placed medial to the internal capsule and the body and tail of the caudate nucleus. Its medial aspect forms the dorsal half of the lateral wall of the third ventricle; its dorsal surface can be subdivided into a lateral triangle forming the floor of the body (central part) of the lateral ventricle, and a medial triangle covered by the velum interpositum; its taillike caudal part curves ventralward around the posterolateral aspect of the cerebral peduncle and ends in the lateral geniculate body. The thalamus is composed of a large number of anatomically and functionally distinct cell groups or nuclei, usually classified as 1) sensory relay nuclei (ventral posterior nucleus and lateral and medial geniculate body), each receiving a modally specific sensory conduction system and in turn projecting each to the corresponding primary sensory area of the cortex; 2) "secondary" relay nuclei (ventral intermediate nucleus and ventral anterior nucleus) receiving fibers from the medial segment of the globus pallidus, the contralateral deep cerebellar nuclei (that is, cerebellothalamic fibers), and the pars reticulata of the substantia nigra that project to various regions of the motor cortex; 3) a nucleus associated with the limbic system, for example, the composite anterior nucleus receiving the mammillothalamic tract and projecting to the fornicate gyrus; 4) association nuclei (medial dorsal nucleus and lateral nucleus including the large pulvinar), each projecting to a particular large expanse of association cortex; or 5) the midline and intralaminar nuclei or "nonspecific" nuclei (centromedian nucleus, central lateral nucleus, paracentral nucleus, and nucleus reuniens).
See also: dorsal thalamus. [G. thalamos, a bed, a bedroom] thalamus (thăl′ə-məs)n. pl. thala·mi (-mī′) A large ovoid mass of gray matter situated in the posterior part of the forebrain that relays sensory impulses to the cerebral cortex.
tha·lam′ic (thə-lăm′ĭk) adj.thal·a·mus, pl. thalami (thal'ă-mŭs, -mī) [TA] The large, ovoid mass of gray matter that forms the larger dorsal subdivision of the diencephalon; it is placed medially to the internal capsule and the body and tail of the caudate nucleus. Its medial aspect forms the dorsal half of the lateral wall of the third ventricle; its dorsal surface can be subdivided into a lateral triangle forming the floor of the body (central part) of the lateral ventricle, and a medial triangle covered by the velum interpositum; its taillike caudal part curves ventralward around the posterolateral aspect of the cerebral peduncle and ends in the lateral geniculate body. [G. thalamos, a bed, a bedroom]thalamus One of two masses of grey matter lying on either side of the midline in the lower part of the brain. It receives sensory nerve fibres from the spinal cord and connections from the midbrain, the eyes, the ears and the cerebral CORTEX. It sends fibres to the sensory part of the cerebral cortex. It is the collecting, coordinating and selecting centre for almost all sensory information, other than OLFACTORY, received by the body. Only part of the mass of information it receives is passed to the cortex. From the Greek thalamos, an inner chamber.thalamus the major sensory coordinating part of the vertebrate forebrain, consisting of two egg-shaped masses of grey matter within the cerebral hemispheres. The thalami act as relay points for all sensory signals entering the brain.ThalamusA large oval area of gray matter within the brain that relays nerve impulses from the basal ganglia to the cerebellum, both parts of the brain that control and regulate muscle movement.Mentioned in: Neurologic Exam, Tremorsthalamus One of a pair of ovoid masses of grey substance that serves as a relay station for sensory stimuli to the cerebral cortex. It contains the lateral geniculate body, which is a continuation of the pulvinar and which is situated at the posterior end of the thalamus. See lateral geniculate bodies.thal·a·mus, pl. thalami (thal'ă-mŭs, -mī) [TA] The large, ovoid mass of gray matter that forms the larger dorsal subdivision of the diencephalon; it is placed medially to the internal capsule and the body and tail of the caudate nucleus. [G. thalamos, a bed, a bedroom]thalamus
Words related to thalamusnoun large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalonRelated Words- neural structure
- geniculate body
- betweenbrain
- diencephalon
- interbrain
- thalmencephalon
- subthalamus
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