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Spinal Nerves
...  represents the region of the vertebral column where the nerve emerges, while the number corresponds to the origin. For example, the cervical nerves have the designation C1 to C8, the thoracic T1 to T12; lumbar L1 to L5 and the sacral nerves S1 to S5; and for the coccyceal nerve, anatomists use the designation C0 to avoid confusion with the cervical nerves. Gross Anatomy When you analyze the  ...

Abdominal Aorta
...  in the human circulatory system as a whole. The abdominal aorta starts out nearly at the same level as the diaphragm. It is located behind the diaphragm and it crosses the aortic hiatus near the T12 vertebral level. From there, it goes down in the anterior section of the vertebral column and the posterior wall of the abdomen while following the general curve of the lumbar vertebrae.  ...


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