Document Detail

Homo floresiensis and the evolution of the hominin shoulder.
MedLine Citation:
PMID:  17692894     Owner:  NLM     Status:  MEDLINE    
The holotype of Homo floresiensis, diminutive hominins with tiny brains living until 12,000 years ago on the island of Flores, is a partial skeleton (LB1) that includes a partial clavicle (LB1/5) and a nearly complete right humerus (LB1/50). Although the humerus appears fairly modern in most regards, it is remarkable in displaying only 110 degrees of humeral torsion, well below modern human average values. Assuming a modern human shoulder configuration, such a low degree of humeral torsion would result in a lateral set to the elbow. Such an elbow joint would function more nearly in a frontal than in a sagittal plane, and this is certainly not what anyone would have predicted for a tool-making Pleistocene hominin. We argue that Homo floresiensis probably did not have a modern human shoulder configuration: the clavicle was relatively short, and we suggest that the scapula was more protracted, resulting in a glenoid fossa that faced anteriorly rather than laterally. A posteriorly directed humeral head was therefore appropriate for maintaining a normally functioning elbow joint. Similar morphology in the Homo erectus Nariokotome boy (KNM-WT 15000) suggests that this shoulder configuration may represent a transitional stage in pectoral girdle evolution in the human lineage.
Susan G Larson; William L Jungers; Michael J Morwood; Thomas Sutikna; Jatmiko; E Wahyu Saptomo; Rokus Awe Due; Tony Djubiantono
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Publication Detail:
Type:  Journal Article     Date:  2007-08-13
Journal Detail:
Title:  Journal of human evolution     Volume:  53     ISSN:  0047-2484     ISO Abbreviation:  J. Hum. Evol.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-12-07     Completed Date:  2008-04-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0337330     Medline TA:  J Hum Evol     Country:  England    
Other Details:
Languages:  eng     Pagination:  718-31     Citation Subset:  IM    
Anatomical Sciences, Stony Brook University School of Medicine, Stony Brook, NY, USA.
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MeSH Terms
Hominidae / anatomy & histology*,  physiology
Shoulder Joint / anatomy & histology*,  physiology

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