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The atlas of StW 573 and the late emergence of human-like head mobility and brain metabolism.

Abstract：

:Functional morphology of the atlas reflects multiple aspects of an organism's biology. More specifically, its shape indicates patterns of head mobility, while the size of its vascular foramina reflects blood flow to the brain. Anatomy and function of the early hominin atlas, and thus, its evolutionary history, are poorly documented because of a paucity of fossilized material. Meticulous excavation, cleaning and high-resolution micro-CT scanning of the StW 573 ('Little Foot') skull has revealed the most complete early hominin atlas yet found, having been cemented by breccia in its displaced and flipped over position on the cranial base anterolateral to the foramen magnum. Description and landmark-free morphometric analyses of the StW 573 atlas, along with other less complete hominin atlases from Sterkfontein (StW 679) and Hadar (AL 333-83), confirm the presence of an arboreal component in the positional repertoire of Australopithecus. Finally, assessment of the cross-sectional areas of the transverse foramina of the atlas and the left carotid canal in StW 573 further suggests there may have been lower metabolic costs for cerebral tissues in this hominin than have been attributed to extant humans and may support the idea that blood perfusion of these tissues increased over the course of hominin evolution.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Beaudet A,Clarke RJ,Heaton JL,Pickering TR,Carlson KJ,Crompton RH,Jashashvili T,Bruxelles L,Jakata K,Bam L,Van Hoorebeke L,Kuman K,Stratford D

doi

10.1038/s41598-020-60837-2

subject

Has Abstract

pub_date

2020-03-16 00:00:00

pages

4285

issue

1

issn

2045-2322

pii

10.1038/s41598-020-60837-2

journal_volume

10

pub_type

杂志文章

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