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Re: Tyrannosaurid neck muscles and feeding style
*falls flat on his face in some mud on the road*
I don't want a copy!
On 8/1/07, Kent A. Stevens <email@example.com> wrote:
> *grabbing tail gate as the bandwagon starts to roll*
> May I get a copy also?
> On Aug 1, 2007, at 1:31 PM, Jura wrote:
> > *Leaps onto bandwagon*
> > I'd love to nab a copy as well.
> > Thanks,
> > Jason
> > --- Guy Leahy <firstname.lastname@example.org> wrote:
> >> Anat Rec (Hoboken). 2007 Aug;290(8):934-57. Links
> >> Functional variation of neck muscles and their
> >> relation to feeding style in Tyrannosauridae and
> >> other
> >> large theropod dinosaurs.Snively E, Russell AP.
> >> Department of Biological Sciences, University of
> >> Calgary, Calgary, Alberta, Canada.
> >> Reconstructed neck muscles of large theropod
> >> dinosaurs
> >> suggest influences on feeding style that paralleled
> >> variation in skull mechanics. In all examined
> >> theropods, the head dorsiflexor m.
> >> transversospinalis
> >> capitis probably filled in the posterior dorsal
> >> concavity of the neck, for a more crocodilian- than
> >> avian-like profile in this region. The
> >> tyrannosaurine
> >> tyrannosaurids Daspletosaurus and Tyrannosaurus had
> >> relatively larger moment arms for lateroflexion by
> >> m.
> >> longissimus capitis superficialis and m. complexus
> >> than albertosaurine tyrannosaurids, and longer
> >> dorsiflexive moment arms for m. complexus. Areas of
> >> dorsiflexor origination are significantly larger
> >> relative to neck length in adult Tyrannosaurus rex
> >> than in other tyrannosaurids, suggesting relatively
> >> large muscle cross-sections and forces.
> >> Tyrannosaurids
> >> were not particularly specialized for neck
> >> ventroflexion. In contrast, the hypothesis that
> >> Allosaurus co-opted m. longissimus capitis
> >> superficialis for ventroflexion is strongly
> >> corroborated. Ceratosaurus had robust insertions for
> >> the ventroflexors m. longissimus capitis profundus
> >> and
> >> m. rectus capitis ventralis. Neck muscle morphology
> >> is
> >> consistent with puncture-and-pull and powerful shake
> >> feeding in tyrannosaurids, relatively rapid strikes
> >> in
> >> Allosaurus and Ceratosaurus, and ventroflexive
> >> augmentation of weaker jaw muscle forces in the
> >> nontyrannosaurids.
> > "I am impressed by the fact that we know less about many modern
> > [reptile] types than we do of many fossil groups." - Alfred S. Romer
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Michael D. Barton
MSU Bozeman, History-SETS Major
Summer 2007: Intern at Heritage and Research
Center, Yellowstone National Park
Reporter: "What do you think of Western Civilization?"
Gandhi: "I think it would be a good idea!"