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Berislav Krzic wrote:

<Rather than round buffalo backs in dinosaurs with "sail", the
cross-section  might have been closer to triangle shape. It certainly
wasn't just skin over the bones on the top of the "sail".>

  There seems, in the vertebrae of *Spinosaurus* (I don't know if
Stromer or Taquet or Russell have discussed this) an expansion that
would have acted as the anchor for the dorsal muscles; thus, the back
muscles would not go all the way to the tip of the spines---however, I
do not think this was so, as there were most probably intra-spinal
muscles to help flex o extend the back, and perhaps a thin layer of
nervous and arterial tissue to use as a cooling system. In
*Ouranosaurus*, however, there are laterally expanded tips at the ends
of the neural spines, suggesting that instead of blades, these were
really "just" elongate and may have supported reasonable lateral
muscles up the bone, as well as intra-spinal muscle and such.

  If anyone can get me the names of these muscles, I'd be most happy
and thankful. Or tell me if they're contemporaneous with mammalian
musculature and I could use anatomical encyclopaedia for the research.

Jaime A. Headden

Qilong, the website, at:
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