Segmental duct
Segmental Seg*men"tal, a. 1. Relating to, or being, a segment. [1913 Webster]

2. (Anat. & Zo["o]l.) (a) Of or pertaining to the segments of animals; as, a segmental duct; segmental papill[ae]. (b) Of or pertaining to the segmental organs. [1913 Webster]

{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) (Zo["o]l.) 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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • segmental duct — noun : the duct of a segmental organ of a vertebrate embryo; especially : the duct of the pronephros that persists after the degeneration of the pronephros, receives the tubules of the mesonephros, becomes the mesonephric duct, and in lower… …   Useful english dictionary

  • Segmental — Seg*men tal, a. 1. Relating to, or being, a segment. [1913 Webster] 2. (Anat. & Zo[ o]l.) (a) Of or pertaining to the segments of animals; as, a segmental duct; segmental papill[ae]. (b) Of or pertaining to the segmental organs. [1913 Webster]… …   The Collaborative International Dictionary of English

  • Segmental organs — Segmental Seg*men tal, a. 1. Relating to, or being, a segment. [1913 Webster] 2. (Anat. & Zo[ o]l.) (a) Of or pertaining to the segments of animals; as, a segmental duct; segmental papill[ae]. (b) Of or pertaining to the segmental organs. [1913… …   The Collaborative International Dictionary of English

  • Segmental tubes — Segmental Seg*men tal, a. 1. Relating to, or being, a segment. [1913 Webster] 2. (Anat. & Zo[ o]l.) (a) Of or pertaining to the segments of animals; as, a segmental duct; segmental papill[ae]. (b) Of or pertaining to the segmental organs. [1913… …   The Collaborative International Dictionary of English

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