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SOMAESTHETIC PATHWAYS IN THE MARSUPIAL PHALANGER, TRICHOSURUS VULPECULA
Author(s) -
Dennis Barbara J,
Kerr DIB
Publication year - 1961
Publication title -
australian journal of experimental biology and medical science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0004-945X
DOI - 10.1038/icb.1961.4
Subject(s) - medial lemniscus , marsupial , biology , anatomy , neuroscience , lateral lemniscus , zoology , stimulation , nucleus , inferior colliculus
SUMMARY Spinal afferent pathways corresponding to the classical somaesthetic projections, medial lemniscus and anterolateral column system, have been described for the marsupial phalanger, Trichosurus vulpecula , using potentials evoked by limb stimulation. Potentials were also evoked within the central tegmental fasciculus and central grey which are considered to be phylogenetically older somaesthetic systems. These projections are relatively conspicuous in comparison with the classical paths, particularly the medial lemniscus. It is considered that the marsupial somaesthetic systems, with a dominance of medical indirect somaesthetic sensory paths, represent a step between the reptilian condition, where such paths predominate, and the full development of more direct spinothalamic projections in the higher mammals.