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Re: Slidey Zygs



Cervical ribs would be a lovely means of further assessing allowance and
constraint in neck movement, and would lead to likely means of using that
to assess possible dorsal tension or ventral compression in sauropod neck
support for various species. However, as regarding zygapophyses, it should
be an interesting lesson that turtles, wether crypto or pleuro, can and
will completely disarticulation portions of their neck during folding in
two points along the neck, either laterally, or dorsoventrally; thus, even
though zygapophyses are large in these forms, they will completely unhinge
them, so there must be more mobility in the zygapophyseal capsules for at
least some species. This may be true for sauropods, as well. In some
birds, including some cranes and flamingos, the cervical vertebrae are
virtual cylinders with almost vestigial apophyses, and yes the necks are
capable of extensive flexure in any direction and about their axes. The
analogy of neck movement not being predicted to zygapophyseal constraint
is not limited to the camel.

  Cheers,

=====
Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

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