medial lemniscus

me·di·al lem·nis·cus

[TA] a band of white fibers originating from the gracile and cuneate nuclei and decussating in the lower medulla; thence it passes upward through the center of the medulla oblongata, close to the median raphe; on entering the pons it spreads out laterally to form a flat band ascending over the superior border of the pontine nuclei; in the mesencephalon it passes over the superior border of the substantia nigra and is displaced laterally by the red nucleus; passing medial to the medial geniculate body, the bundle enters and terminates in the ventral posterior nucleus of the thalamus. Throughout their course, the fibers retain a somatotopic order such that those originating from the gracile nucleus and representing the lower extremity lie lateral to those originating in the cuneate nucleus and representing the arm. The medial lemniscus conveys somatic-sensory information involved in tactile discrimination (2-point discrimination), position sense, and vibration sense. Synonym(s): lemniscus medialis [TA], medial fillet, Reil band (2) , Reil ribbon

medial lemniscus

An axon tract originating in the cuneate and gracile nuclei, at the junction between the spinal cord and brainstem, and ascending to the ventral posterior nucleus of the thalamus. This lemniscus is a middle link in the circuit carrying somatic sensory information from the body to the primary sensory cortex. See also: lemniscus

Reil,

Johann C., German physician, neurologist, and histologist, 1759-1813. circular sulcus of Reil - a semicircular fissure. Synonym(s): circular sulcus of insula; limiting sulcus of Reilisland of Reil - an oval region of the cerebral cortex overlying the extreme capsule, lateral to the lenticular nucleus, buried in the depth of the fissura lateralis cerebri (sylvian fissure). Synonym(s): insula; insular area; insular cortexlimiting sulcus of Reil - Synonym(s): circular sulcus of ReilReil ansa - a complex fiber bundle. Synonym(s): ansa peduncularisReil band - Synonym(s): medial lemniscus; septomarginal trabeculaReil ribbon - Synonym(s): medial lemniscusReil triangle - Synonym(s): lemniscal trigone

单词	medial lemniscus
释义	DictionarySeelemniscus medial lemniscus medial lemniscus [′mē·dē·əl lem′nis·kəs] (anatomy) A lemniscus arising in the nucleus gracilis and nucleus cuneatus of the brain, crossing immediately as internal arcuate fibers, and terminating in the posterolateral ventral nucleus of the thalamus. medial lemniscus me·di·al lem·nis·cus [TA] a band of white fibers originating from the gracile and cuneate nuclei and decussating in the lower medulla; thence it passes upward through the center of the medulla oblongata, close to the median raphe; on entering the pons it spreads out laterally to form a flat band ascending over the superior border of the pontine nuclei; in the mesencephalon it passes over the superior border of the substantia nigra and is displaced laterally by the red nucleus; passing medial to the medial geniculate body, the bundle enters and terminates in the ventral posterior nucleus of the thalamus. Throughout their course, the fibers retain a somatotopic order such that those originating from the gracile nucleus and representing the lower extremity lie lateral to those originating in the cuneate nucleus and representing the arm. The medial lemniscus conveys somatic-sensory information involved in tactile discrimination (2-point discrimination), position sense, and vibration sense. Synonym(s): lemniscus medialis [TA], medial fillet, Reil band (2) , Reil ribbon medial lemniscus An axon tract originating in the cuneate and gracile nuclei, at the junction between the spinal cord and brainstem, and ascending to the ventral posterior nucleus of the thalamus. This lemniscus is a middle link in the circuit carrying somatic sensory information from the body to the primary sensory cortex. See also: lemniscus Reil, Johann C., German physician, neurologist, and histologist, 1759-1813. circular sulcus of Reil - a semicircular fissure. Synonym(s): circular sulcus of insula; limiting sulcus of Reilisland of Reil - an oval region of the cerebral cortex overlying the extreme capsule, lateral to the lenticular nucleus, buried in the depth of the fissura lateralis cerebri (sylvian fissure). Synonym(s): insula; insular area; insular cortexlimiting sulcus of Reil - Synonym(s): circular sulcus of ReilReil ansa - a complex fiber bundle. Synonym(s): ansa peduncularisReil band - Synonym(s): medial lemniscus; septomarginal trabeculaReil ribbon - Synonym(s): medial lemniscusReil triangle - Synonym(s): lemniscal trigone
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