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Re: Anatomical terms
Graeme Worth originally asked for explanation of some anatomical terms,
to which David Marjanovic answered [shortened]:
> > pubic plate
> If not the pubic apron, then perhaps the entire pubis in animals
> (non-dinosaurs...) in which it isn't a long bone.
in prosauropods the pubis is plate-like, anatomically the pubic apron is
the ala pubis ("wing").
> > ischial foot
> An expansion of the distal end of the ischium. *Allosaurus* has both a
> pubic and an ischia_dic_ foot.
Nick Gardner disagreed (?):
> A distal expansion of the ilium, look at most non-coelurosaurian tetanurans
> for an example.
"ischial foot": Anatomically: processus terminalis ischii. Present in
"ischiadic peduncle" (if this is what Nick Gardner had in mind):
Processus articularis ossis ischii (a posterior lower process of ilium).
> > sacrocostal (yoke)
> Made of the fused sacral costae = ribs.
Not quite true. Sacral ribs do fuse distally and sometimes even
proximally in many archosaurs. If the sacrum (with its ribs) fuses to
the ilia, then it is called a synsacrum. A sacrocostal yoke [some say
sacricostal yoke] (iugum sacrocostale) is present if the sacral ribs do
contribute to the acetabulum, i. e. they have direct contact with the
femur by a distinct articular surface. The sacrocostal yoke then
subjugates the femur so to say. This is only present in sauropods.
Dr. Markus Moser
Bayerische Staatssammlung fuer Palaeontologie und Geologie
Ludwig-Maximilians-Universitaet Muenchen, Department fuer
Geo- und Umweltwissenschaften, Sektion Palaeontologie