protoduodenum

protoduodenum

 [pro″to-doo″o-de´num]
the first or proximal portion of the duodenum, extending from the pylorus to the duodenal papilla.

pro·to·du·o·de·num

(prō'tō-dū'ō-dē'nŭm),
The first part of the duodenum, which extends from the gastroduodenal pylorus as far as the major duodenal papilla and develops from the caudal foregut of the embryo; it has no plicae circulares and is the location of the duodenal glands.

protoduodenum

(1) Primitive duodenum; duodenum primitivum [NE3]. 
(2) An obsolete term for the part of the definitive duodenum that develops from embryonic foregut.

pro·to·du·o·de·num

(prō'tō-dū'ō-dē'nŭm, dū-od'ĕ-nǔm)
The first part of the duodenum, which extends from the pylorus as far as the major duodenal papilla and develops from the caudal foregut of the embryo; it has no circular folds of the small intestine and is the location of the duodenal glands.