A comparative study on the cortico-hypoglossal connections in primates, using biotin dextranamine

The anterograde projections of the motorcortical tongue area to the hypoglossal nucleus and neighbouring structures were studied in the rhesus monkey, squirrel monkey, saddle-back tamarin and tree shrew. Biotin dextranamine served as tracer. Direct projections into the hypoglossal nucleus were only...

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Veröffentlicht in:Neuroscience letters 2002-08, Vol.328 (3), p.245-248
Hauptverfasser: Jürgens, U, Alipour, M
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Alipour, M
description The anterograde projections of the motorcortical tongue area to the hypoglossal nucleus and neighbouring structures were studied in the rhesus monkey, squirrel monkey, saddle-back tamarin and tree shrew. Biotin dextranamine served as tracer. Direct projections into the hypoglossal nucleus were only found in the rhesus monkey and squirrel monkey. All four species, however, showed a direct projection into the dorsal and parvocellular reticular formation which in turn projects into the hypoglossal nucleus. The findings suggest a phylogenetic trend in the projections of the motorcortical tongue area from non-primate mammals via non-human primates to man in the sense that the cortico-motoneuronal connection is strengthened towards man. This might be one reason for the superior role the tongue plays in human vocal behaviour in contrast to non-human vocalization.
doi_str_mv 10.1016/S0304-3940(02)00525-6
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Anatomy
Animals
Biological and medical sciences
Biotin - analogs & derivatives
Central nervous system
Cortical projections
Dextrans
Fluorescent Dyes
Fundamental and applied biological sciences. Psychology
Hypoglossal Nerve - physiology
Hypoglossal nucleus
Motor cortex
Motor Cortex - physiology
Neural Pathways - physiology
Primates - physiology
Reticular Formation - physiology
Rhesus monkey
Saddle-back tamarin
Squirrel monkey
Synaptic Transmission - physiology
Tongue representation
Tree shrew
Vertebrates: nervous system and sense organs
title A comparative study on the cortico-hypoglossal connections in primates, using biotin dextranamine
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