Brain, Behavior and Evolution

 

Regional Brain Morphometry and Lissencephaly in the Sirenia

Reep R.L.a · O’Shea T.J.b

Author affiliations

a Departments of Physiological Sciences and Neuroscience, University of Florida; b Fish and Wildlife Service, National Ecology Research Center, Gainesville, Fla., USA

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Brain Behav Evol 1990;35:185–194

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Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: February 01, 2008
Issue release date: 1990

Number of Print Pages: 10
Number of Figures: 0
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: https://www.karger.com/BBE

Abstract

Neuroanatomical structure was examined in the brains of West Indian manatees (Trichechus manatus) using computer-based morphometric methods. Although manatees have a small relative brain size, volume estimates of the major brain regions indicate that the telencephalon comprises 71% of totalbrain volume and is 90% cerebral cortex. These values are comparable to those seen among a diversity of taxa having large relative brain size, including many primates. Manatee brains also exhibit well-defined cortical lamination. The measured gyration index (an index of cortical folding) was 1.06, representing a highly lissencephalic condition. These findings demonstrate that small relative brain size and lissencephaly do not constrain the elaboration of internal brain structures. The marked lissencephalic condition is unusual for brains of this absolute size range, and may be related to the thickness of the cortical gray matter and underlying white matter.

© 1990 S. Karger AG, Basel




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Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: February 01, 2008
Issue release date: 1990

Number of Print Pages: 10
Number of Figures: 0
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: https://www.karger.com/BBE


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