oviduct


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oviduct:

see fallopian tubefallopian tube
, either of a pair of tubes extending from the uterus to the paired ovaries in the human female, also called oviducts, technically known as the uterine tube.
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Oviduct

 

a female reproductive duct (usually paired) that serves mainly for the passage of mature eggs, or ova, that have formed in the ovary. The oviduct may be the direct continuation of the ovary (roundworms, arthropods, and echinoderms), or it may be completely isolated from the ovary. In the latter case, the oviduct opens anteriorly into the coelom and posteriorly into the cloaca (most vertebrates) or to the surface (annelid worms and mammals). Sexual funnels of annelid worms serve as the oviducts; most vertebrates have müllerian ducts, which develop from the primary renal duct. The oviducts of sturgeons and Holostei lie next to the ovaries. In most bony fishes the oviducts and ovaries are fused.

The egg is usually propelled through the oviduct by the contraction of the muscular walls or by movement of the cilia of the epithelium lining the cavity of the duct. The oviduct usually has various membranes. Its walls secrete coating substances; sometimes the substances are elaborated only by special regions of the ducts. For example, cephalopod mollusks have a special oviduct gland, and cartilaginous fishes have a shell gland.

The portion of the oviduct in which the eggs or embryos mature is called the uterus. Mammalian eggs are fertilized in the fallopian, or uterine, tubes, which are situated above the uterus. The terminal portion of the oviduct in organisms marked by internal fertilization (with the oviduct opening to the exterior) is called the vagina.

oviduct

[′ō·və‚dəkt]
(anatomy)
A tube that serves to conduct ova from the ovary to the exterior or to an intermediate organ such as the uterus. Also known in mammals as Fallopian tube; uterine tube.

oviduct

the tube through which ova are conveyed from an ovary
References in periodicals archive ?
Rapid inhibition of c-myc gene expression by a glucocorticoid in the avian oviduct.
In addition, the standard weight of the total reproductive system, left ovary and left oviduct, had no significant changes in the experimental groups when compared to the control group (Table 1).
In the Oviduct set, for example, Quinn has made slightly abstracted cast-porcelain representations of the tube that serves as conduit for eggs; a series of these will hang on the wall, in ascending and then descending size.
The reproductive system of the hen is divided into two main parts, the ovary and the oviduct.
7 (mean [+ or -] SD) Left oviduct 46 Right oviduct 65 Morphology Grade I 109 Grade II 2 No of blastomeres 518 Blastomeres/embryo 4.
The first thick layer is wound into a spiral by the hen's oviduct to form the "chalazae"--from the Greek word for hailstone or small lump.
Then the yolk breaks free and starts a slow journey through the oviduct.
1-3 of Bertani & Silva Junior 2002), can deposit more sperm in the female's oviduct, which is where she retains the sperm because she does not have spermathecae).
Laying hen weight, relative weight of abdominal fat, oviduct and ovary of laying hens fed with different digestible lysine levels.
The hypothesis is that the role of the oviduct might not only be mechanical by allowing gamete and embryo transport, but physiological as well, in providing nutrients and other factors important in embryo development.