Re: Sauropod neck ribs are ossified tendons (free pdf)

[Rubén Juárez <rubendjuarez@gmail.com>]

This was previously published by Ignacio Cerda in 2009:

Cerda, I. A. (2009). Consideraciones sobre la histogénesis de las
costillas cervicales en los dinosaurios saurópodos. Ameghiniana,
46(1), 193–198.


It is sad that some paleontologists from the northern hemisphere do
not know the research conducted by scientists from around the world,
since they have not even mentioned the previous work.

Greetings, Rubén.




2012/10/3 Ben Creisler <bcreisler@gmail.com>:
> From: Ben Creisler
> bcreisler@gmail.com
>
>
> A new online paper--the pdf is free:
>
>
> Nicole Klein, Andreas Christian and P. Martin Sander (2012)
> Histology shows that elongated neck ribs in sauropod dinosaurs are
> ossified tendons.
> Biology Letters (advance online publication)
> doi: 10.1098/rsbl.2012.0778
> http://rsbl.royalsocietypublishing.org/content/early/2012/09/26/rsbl.2012.0778.short?rss=1
>
>
>
> The histology of cervical ribs of Sauropoda reveals a primary bone
> tissue, which largely consists of longitudinally oriented mineralized
> collagen fibres, essentially the same tissue as found in ossified
> tendons. The absence of regular periosteal bone and the dominance of
> longitudinal fibres contradict the ventral bracing hypothesis (VBH)
> postulated for sauropod necks. The VBH predicts histologically primary
> periosteal bone with fibres oriented perpendicular to the rib long
> axis, indicative of connective tissue between overlapping
> hyperelongated cervical ribs. The transformation of the cervical ribs
> into ossified tendons makes the neck more flexible and implies that
> tension forces acted mainly along the length of the neck. This is
> contrary to the VBH, which requires compressive forces along the neck.
> Tension forces would allow important neck muscles to shift back to the
> trunk region, making the neck much lighter.



-- 
“Verrà il giorno in cui l’uccisione di un animale sarà considerata
alla stessa stregua dell’uccisione di un uomo ” Leonardo da Vinci


Rubén Darío Juárez Valieri
some place, some province...Argentina...
rubendjuarez@gmail.com
+5492984356133