Structure [edit]. The abdominal aorta begins at the level of the diaphragm, crossing it via the aortic hiatus, technically behind the diaphragm, at the vertebral level of T12. It travels down the posterior wall of the abdomen, anterior to the vertebral column.tructure [edit]. The abdominal aorta begins at the level of the diaphragm, crossing it via the aortic hiatus, technically behind the diaphragm, at the vertebral level of T12. It travels down the posterior wall of the abdomen, anterior to the vertebral column.
Lewis and Clark had to think ahead and plan for times when wild game would be unavailable or in short supply. Their keelboat was stocked with nearly 7 tons of dry goods, including flour, salt, coffee, pork, meal, corn, sugar, beans and lard.
When Thomas Jefferson dispatched Lewis and Clark to find a water route across North America and explore the uncharted West, he expected they'd encounter woolly mammoths, erupting volcanoes, and a mountain of pure salt. What they found was no less surprising. See it all on our journey: journal entries, historical photos, drawings, and more.