Description: Chapter Vessles and lympatic drainage of the lower limb Venous drainage. The chief superficial veins are the great and small saphenous veins. The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and arkangels.info fish, the divisions of the small intestine are not as clear, and the terms anterior intestine or proximal intestine may be used instead of duodenum. In mammals the duodenum may be the principal site for iron absorption. The duodenum .
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