Seg*men"tal(?), a. 1. Relating to, or being, a segment.
(Anat. & Zol.) (a) Of or pertaining to the segments of animals; as, a
segmental papill. (b) Of or pertaining to the segmental organs.
(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)
(Zol.) 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. --
(Anat.), the tubes which primarily open into the segmental duct, some of which become the urinary tubules of the adult.
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Tue 11th December 2018