Category:Segmental

Seg*men"tal, a.

1. Relating to, or being, a segment.

2. (anat. & zoöl.) (a) of or pertaining to the segments of animals; as, a segmental Duct; segmental papillæ. (b) of or pertaining to the segmental organs. Segmental duct (anat.), The primitive duct of the embryonic excretory organs which gives rise To the wolffian duct and ureter; the pronephric duct. -- segmental organs. (a) (anat.) The embryonic excretory organs of Vertebrates, consisting primarily of the segmental tubes and Segmental ducts. (b) (zoöl.) The tubular excretory organs, a pair of Which often occur in each of several segments in annelids. They serve As renal organs, and often, also, as oviducts and sperm ducts. See Illust. under sipunculacea. -- segmental tubes (anat.), the tubes which primarily open into the Segmental duct, some of which become the urinary tubules of the Adult.