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* [[Anus]] - The opening at the end of the digestive tract from which feces exit the body. ...scomfort or pain located in the back area, often caused by muscle strains, spinal problems, or nerve issues.

* [[Alimentary canal]] - another term for the digestive tract * [[Anencephaly]] - a fatal birth defect in which the brain and spinal cord have failed to develop, resulting in the absence of a portion of the s