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- W2089235837 abstract "We characterized spinomedullary neurons that project to the ventrolateral portion of the medulla that receives lamina I terminations in two sets of experiments in the cat. First, their distribution was examined using single unilateral iontophoretic injections of cholera toxin subunit B. The injection sites were characterized by microelectrode recordings from nociceptive- and thermoreceptive-specific units, indicative of lamina I input. The spinomedullary neurons were symmetrically distributed bilaterally, predominantly (63–69%) in lamina I but also in laminae V–VIII and the thoracic lateral horn (intermediolateral cell column). In horizontal sections, spinomedullary lamina I neurons included all three main morphological types described earlier. Second, spinomedullary and spinothalamic neurons were compared in retrograde double-labeling experiments. Different combinations of tracers were injected in the right thalamus and the left or right ventrolateral medulla (guided by recordings). The numbers of spinomedullary and spinothalamic neurons on the left side were comparable, and the segmental and laminar distributions were similar, except that a greater proportion of spinomedullary neurons originated from thoracic segments. However, the proportion of double-labeled neurons was consistently ∼1%, indicating that spinomedullary and spinothalamic pathways arise from separate subpopulations. Spinomedullary neurons were more ventrally located within lamina I than spinothalamic neurons. A significantly greater proportion of spinomedullary neurons had fusiform somata (49% vs. 36%). These observations indicate that lamina I is the major source of spinal input to this portion of the ventrolateral medulla, that the projection includes several morphological types of inputs, and that this projection is distinct from the spinothalamic projection. These findings are consistent with the concept that lamina I projections constitute an ascending homeostatic afferent pathway relating the physiological condition of the body. J. Comp. Neurol. 458:257–271, 2003. © 2003 Wiley-Liss, Inc." @default.
- W2089235837 created "2016-06-24" @default.
- W2089235837 creator A5031930865 @default.
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- W2089235837 date "2003-02-26" @default.
- W2089235837 modified "2023-09-24" @default.
- W2089235837 title "Differentiation of lamina I spinomedullary and spinothalamic neurons in the cat" @default.
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- W2089235837 doi "https://doi.org/10.1002/cne.10592" @default.
- W2089235837 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12619080" @default.
- W2089235837 hasPublicationYear "2003" @default.
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