Definition of Gill clefts. Meaning of Gill clefts. Synonyms of Gill clefts

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Definition of Gill clefts

Gill clefts
Gill Gill, n. [Dan. gi[ae]lle, gelle; akin to Sw. g["a]l, Icel. gj["o]lnar gills; cf. AS. geagl, geahl, jaw.] 1. (Anat.) An organ for aquatic respiration; a branchia. Fishes perform respiration under water by the gills. --Ray. Note: Gills are usually lamellar or filamentous appendages, through which the blood circulates, and in which it is exposed to the action of the air contained in the water. In vertebrates they are appendages of the visceral arches on either side of the neck. In invertebrates they occupy various situations. 2. pl. (Bot.) The radiating, gill-shaped plates forming the under surface of a mushroom. 3. (Zo["o]l.) The fleshy flap that hangs below the beak of a fowl; a wattle. 4. The flesh under or about the chin. --Swift. 5. (Spinning) One of the combs of closely ranged steel pins which divide the ribbons of flax fiber or wool into fewer parallel filaments. [Prob. so called from F. aiguilles, needles. --Ure.] Gill arches, Gill bars. (Anat.) Same as Branchial arches. Gill clefts. (Anat.) Same as Branchial clefts. See under Branchial. Gill cover, Gill lid. See Operculum. Gill frame, or Gill head (Flax Manuf.), a spreader; a machine for subjecting flax to the action of gills. --Knight. Gill net, a flat net so suspended in the water that its meshes allow the heads of fish to pass, but catch in the gills when they seek to extricate themselves. Gill opening, or Gill slit (Anat.), an opening behind and below the head of most fishes, and some amphibians, by which the water from the gills is discharged. In most fishes there is a single opening on each side, but in the sharks and rays there are five, or more, on each side. Gill rakes, or Gill rakers (Anat.), horny filaments, or progresses, on the inside of the branchial arches of fishes, which help to prevent solid substances from being carried into gill cavities.

Meaning of Gill clefts from wikipedia

- Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. Such gills are characteristic of cartilaginous...
- first, third, or fourth clefts, and their location and the location of ****ociated fistulas differs accordingly. Most branchial cleft cysts present in late...
- of this subcl**** are characterised by having five to seven pairs of gill clefts opening individually to the exterior, rigid dorsal fins and small placoid...
- pharyngeal grooves (or clefts) form the lateral ectodermal surface of the neck region to separate the arches. The pouches line up with the clefts, and these thin...
- pairs of gills, depending on the species. In general, pelagic species must keep swimming to keep oxygenated water moving through their gills, whilst demersal...
- embryos, absence of blastopore in dogfish, and differences in the gill slits and gill clefts. He concluded: There is no stage of development in which the unaided...
- grooves (or clefts) form from the lateral ectodermal surface of the neck region to separate the arches. In fish the pouches line up with the clefts, and these...
- the gills. Branchial artery, also known as aortic arches. Branchial cleft Branchial cleft cyst, failure of obliteration of the second branchial cleft in...
- do not have this type of gill-slits. Some authors doubt whether the gill-slits of Balanoglossus really are pharyngeal clefts as in one species of Balanoglossus...
- fins, and external gills. At an embryonic length of 2.0–2.7 mm (0.079–0.106 in), the gill clefts close dorsally, leaving the gill slits beneath the disc...
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