protoduodenum

[ prō′tō-dōō′ə-dēnəm, -dōō-ŏdn-əm ]

n.

The first part of the duodenum extending from the gastroduodenal pylorus to the major duodenal papilla and containing the duodenal glands.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.