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RE: FLIGHT & CATS
Tracy Ford (firstname.lastname@example.org) wrote:
<Where is the glenoid in gliding squirrels and lemurs? Is it high on the body
like birds? I was
thinking of going to the San Diego Zoo and trying to get some of the handlers
to show me. Maybe
Tim Williams (email@example.com) wrote:
<Good question. Though you would probably want to compare gliding and
Even those animals that don't glide may have a glenoid facing upwards for
normal arboreal living
(vertical clinging, reaching up to grasp branches, etc). Definitely something
I can answer this, if you want a quick answer. Based on my observations of
the pectoral girdles
of various arboreal animals, including lemuriforms and relatively arboreal
primates, the glenoid
faces laterally and to the posterior. Without relocation of muscle attachment
on the scapula,
reshaping the scapula, and rotation of the scapula, the glenoid cannot face
dorsally -- this would
result in a shallow scapular crest, a robust coracoid process, a very broad
oblique to the vertebral column, and the humerus attached so that the forearms
bent outwards only;
it would not be further possible, based on a cursory [thanks, Darren :)]
examination, for the arm
to rotate at the shoulder as much as it does in the normal position. One loses
mobility at such a
position; humans enjoy the mobility we have because the glenoid facets
laterally _only_, and the
humeral head is globular, allowing the greatest range of movement.
In gliding squirrels, it appears to face normally, i.e., ventrally, rather
than in any other
direction, as in "normal" squirrels, but don't quote me on that.
Jaime A. Headden
Where the Wind Comes Sweeping Down the Pampas!!!!
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