Mosaic evolution of brainstem motor nuclei in catarrhine primates.

Anatomy Research International
Seth D Dobson, Chet C Sherwood

Abstract

Facial motor nucleus volume coevolves with both social group size and primary visual cortex volume in catarrhine primates as part of a specialized neuroethological system for communication using facial expressions. Here, we examine whether facial nucleus volume also coevolves with functionally unrelated brainstem motor nuclei (trigeminal motor and hypoglossal) due to developmental constraints. Using phylogenetically informed multiple regression analyses of previously published brain component data, we demonstrate that facial nucleus volume is not correlated with the volume of other motor nuclei after controlling for medulla volume. Our results show that brainstem motor nuclei can evolve independently of other developmentally linked structures in association with specific behavioral ecological conditions. This finding provides additional support for the mosaic view of brain evolution.

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Citations

Mar 14, 2014·PloS One·Cristián Gutiérrez-IbáñezDouglas R Wylie
May 30, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Seth Dobson
Jun 22, 2019·Central Nervous System Agents in Medicinal Chemistry·Saganuwan Alhaji Saganuwan

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