Upright Rearing (Was Sauropod movement-- long)

[Mark Hallett <marksabercat@yahoo.com>]

Hi Mike, I'm sorry but I don't have this post anymore.
It would be available, however, in the DML Archives.
The gist of my coments was a reponse to Kent regarding
the possible limitations of the the paired
caudofemoralis' mass in enabling a given sauropod
species (especially diplodocoids) to rear upright. As
Kent suggests these indeed may have been insufficient
for doing this by themselves, but I had envisioned the
dorsal spinal retractor mm., as well as the paired
caudotruncus mm., as having a role in pulling the
trunk up and backwards (in the case of the former) and
down (in the case of the latter; this idea assumes
that the pelvis would rotate caudo-anteriorly around
the fixed pivot point of the acetabulum, which would
remain in a relatively rigid position because of the
tension on the hind limb and immobility of the feet
against the substrate. Regarding Janensche's 1918
reference, I may have had the date wrong-- on checking
my photocopy version I don't have the page with the
publication date. Gerhard Meier in his book Unearthing
African Dinosaurs makes a secondhand reference to the
position of the auditory bones. Hope all is well with
you. Best Wishes, Mark Hallett  
--- Mike Taylor <mike@indexdata.com> wrote:
> > Date: Wed, 14 Apr 2004 22:18:19 -0700 (PDT)
> > From: Mark Hallett <marksabercat@yahoo.com>
> >
> > What about the possible effect that the
> caudotruncus
> > muscle and collective dorsal spinal muscle groups
> may
> > have had in sauropod rearing?
> > [...]
> 
> Hi Mark, Kent,
> 
> This message escaped onto the DML, but seems to be
> the only part of
> your thread that's there.  I would be interested to
> see the rest of
> this thread if you have no objection?
> 
> Also:
> 
> > However, in spite of the fact that
> > in dinosaurs the brain was certainly not the
> complex
> > "Grand Central Station" of body motor control that
> > mammalian brains are, it may still have had
> sufficient
> > ability to direct visual input to complex neural
> > plexes that took over much of this function (motor
> > control of the limbs), after getting feedback from
> the
> > eyes and semicircular canals, which are known to
> be
> > well developed in Brachiosaurus (Janensch, 1918).
> 
> Do you have the full version of the Janensch 1918
> reference.
> Janensch's dinodata.net refbase entry at
>       http://dinodata.net/Refs/J/JANENSCH.htm
> only doesn't list anything from 1918.  The Glut
> encyclopedias (core
> volume and all three supplements) don't list
> anything by Janensch
> between 1914 and 1920.  I'd be interested to dig
> this one up.
> 
> Thanks.
> 
>  _/|_ 
>
_______________________________________________________________
> /o ) \/  Mike Taylor  <mike@indexdata.com> 
> http://www.miketaylor.org.uk
> )_v__/\  "Can't talk.  Eating" -- Homer Simpson.
> 
> --
> Listen to my wife's new CD of kids' music, _Child's
> Play_, at
>       http://www.pipedreaming.org.uk/childsplay/
> 



        
                
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