Medical Definition of Medial lemniscus

1. A band of white fibres originating from the gracile and cuneate nuclei and decussating in the lower medulla; thence it passes upward through the centre 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 dorsal border of the pontine nuclei; in the mesencephalon it passes over the dorsal 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 fibres 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 (two-point discrimination), position sense, and vibration sense. Synonym: lemniscus medialis, medial fillet, Reil's band, Reil's ribbon. (05 Mar 2000)



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Lexicographical Neighbors of Medial Lemniscus

medial femoral circumflex artery
medial femoral tuberosity
medial fillet
medial forebrain bundle
medial frontobasal artery
medial geniculate body
medial geniculate nucleus
medial great muscle
medial head
medial inferior genicular artery
medial inguinal fossa
medial lacunar lymph node
medial lacunar node
medial lamina of cartilaginous auditory tube
medial layer of cartilaginous auditory tube
medial lemniscus (current term)
medial ligament
medial ligament of knee
medial ligament of talocrural joint
medial ligament of wrist
medial limb
medial lip of linea aspera
medial longitudinal arch of foot
medial longitudinal bundle
medial longitudinal fasciculus
medial longitudinal stria
medial lumbar intertransversarii muscles
medial lumbar intertransverse muscles
medial lumbocostal arch
medial malleolar arteries

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