Information gleaned from records of gravid females and known dates of nesting suggests that eggs are retained in the oviducts two to three weeks before laying.
Darkening of oviducts seemed to coincide with the period when eggs were in the oviducts and it persisted for a variable length of time after the eggs were laid.
Insemination Oviducts of several females were flushed by means of a pipette to determine whether they contained sperm.
Comparative Rates of Fertility and Prenatal Mortality for Eggs Dissected from Oviducts and for Eggs That Were Laid in the Laboratory and Subsequently Removed to Incubation Dishes.
There are two oviducts (right and left) in the female, and two sperm-ducts in the male, the left duct in both sexes being rudimentary.
In Argiope, which may be taken as typical of the first group, the ova are transported into the oviducts (segmental organs) where they undergo their early development.
The oviducts unite into a vagina, usually provided with a spermatheca and accessory glands, which need not be further alluded to.
In similar specimens the oviducts were also followed to the opening from within.
The writers have been able to determine from external examination of specimens which had moulted and were about to lay eggs, that the oviducts at such time open to the inside of the base of each walking leg on the fifth segment.
Salmonidae, the smelt (Osmerus) and capelin (Mallotus) possess a pair of oviductsresembling Muellerian ducts while the salmon possesses merely a pair of genital pores opening together behind the anus.
The ducts are present only as a single pair, except in one genus of parasitic Isopoda (Hemioniscus), where two pairs of oviducts are found.
The oviductsmay have diverticula serving as receptacles for the spermatozoa (in cases where internal impregnation takes place), and may be provided with glands secreting envelopes or shells around the eggs.
The ovary is double, and the oviducts open by a median ventral pore about the middle of the body; in this region there is a second swelling both in Chaetosoma and in Rhabdogaster.
It is possible, however, that those oviducts belong to a separate morphological category, more comparable to the dorsal pores and to abdominal pores in some fishes.
While theoviducts always open directly on to the exterior, it is the rule for the sperm ducts to open on to the exterior near to or through certain terminal chambers, which have been variously termed atrium and prostate, or spermiducal gland.
Temporary oviducts are formed between the "sperm-duct" and the germinal epithelium at each oviposition.
The oviducts are always short trumpet-shaped tubes and are sometimes reduced (Enchytraeidae) to merely the external orifices.
To this category will belong the oviducts in Teleostean fishes and probably the gonad ducts in several groups of invertebrates.
The oviducts are large, swollen and convoluted, resembling those in sexually mature individuals.
Presumably enlargement of the eggs occurs in the oviducts and within a short period after deposition prior to complete hardening of the brittle shell; therefore some eggs in the oviducts are smaller than those in nests.
Some eggs are occasionally abnormal in shape and size; overcrowding of eggs in the oviducts may result in small, irregular-shaped eggs, or large double-yolked eggs.
The other guadalupensis whose measurements are given above haveoviducts that do not exceed four millimeters in width, and ovarian follicles that do not exceed two millimeters in diameter.
In the female find the opening of the oviducts in front of the liver.
The oviducts of the female do not fuse distally to form a median vagina as they do in the rabbit.
Mark with flag-labels the duct of the pancreas, the ureters, and the oviducts or the sperm ducts (as the case may be).
The two oviducts meet in front of the liver ventral to the oesophagus, and have there a common opening by which the ova are received after being shed into the body cavity.
The two oviducts unite behind, and form a very short uterus.
The capsule is formed by the secretion of a “colleterial” gland, poured out upon the inner surface of a chamber (vulva) into which the oviducts lead.
Incubation may be shortened by retention of ova in the oviducts in early stages of embryonic development.
A series of gravid females were obtained and examined after ovulation; the numbers of eggs in their oviducts probably indicates accurately the sizes of their clutches.
In the following weeks both the ova and the oviducts enlarge rapidly.
In the immature female the oviducts are small and threadlike, and the ovaries have grapelike clusters of pale whitish eggs, which are minute, often less than .
Condition in late May shortly before ovulation; the greatly enlarged ovaries are removed to expose the oviducts (OD) now enlarged and convoluted for reception of the ova.
In social combinations we have the ciliated cells of the ciliated epithelium of the higher animals--for instance, in the lungs, nostrils, and oviducts of vertebrates.
In mammals theoviducts are also called Fallopian tubes.
Defn: A receptacle, or pouch, connected with the oviducts of many invertebrates in which the eggs are retained until they hatch or until the embryos develop more or less.
They serve as renal organs, and often, also, as oviducts and sperm ducts.
The cavity of the womb is small and has three openings, two near the top leading into the oviducts and one at the bottom opening into the (4) vagina.
There we see eggs in that part of the oviducts contiguous to the vulva, much farther advanced, and larger than those contained in the opposite part.
On dissection, her ovaries were found more fragile, smaller and composed of fewer oviducts than the ovaries of queens.
In these last, the oviducts to all appearance were but imperfectly developed, and more address than we had acquired in dissection was necessary to distinguish them.
He observes that he has never been able to find the termination of the oviducts in the abdomen, nor any other parts excepting those which he has described.
We may take this opportunity of remarking, that it is in the oviducts themselves the eggs are imbued with the viscous liquid, with which they are produced, and not in passing through the spherical sac as Swammerdam believed.
There are usually two oviducts and two seminal tubes to be found.
In the female the oviducts pass together as complete cornua into an uterus.
Between the vesiculæ seminales and the vagina or the penis the uterus shrivels up into the prostate gland, into which the vasa deferentia open, like the oviducts do into the uterus.
The semen and oviducts are salivary ducts; they open by twos and symmetrically.
Both are in other respects constructed as in Insects, namely, there are two oviductsor seminal ducts, which unite before reaching their external orifice.
In the lowest organized animals, the oviducts seminal and urinary ducts together run into it, as into a proper mouth.
The oviducts or egg-tubes lie between the intestine and tegument, and open upon the margin of the mouth between the tentacula.
As the trumpet-like tubes or oviductsbelong to the ovaria, so are they developed with the testes, and now convey semen instead of ova.
In mammals the oviducts are also called Fallopian tubes.
A receptacle, or pouch, connected with the oviducts of many invertebrates in which the eggs are retained until they hatch or until the embryos develop more or less.
The lowest of the mammalia--the Monotremata--in common with birds, have oviducts which towards their lower extremities are dilated into cavities severally performing in an imperfect way the function of a uterus.
Finally, in the apes and in man the blending of the two halves is complete, and there is only the one simple, pear-shaped uterine pouch, into which the oviducts open on each side.
The oviducts proper are developed only from their upper part; the lower part dilates into a spindle-shaped tube with thick muscular wall, in which the impregnated ovum develops into the embryo.
The oviductshave separate openings, but originate together.
He claims to have been one of the first to show the termination of the oviducts and renal organs between the processes of the branchiae in the Chitons.
The connection of the genital duct with this cephalic gland being then closed and cut off by the brain-case, the position of the oviducts would still be shown by the ciliated grooves opening into the folded-down thyroid tube, i.
Next, in the degeneration process, we may suppose that not only the oviducts opened out to form the ciliated groove, but that the uterine chamber itself also opened out, and thus formed the endostyle of Amphioxus and of the Tunicata.
A few batrachians retain the ova within the oviducts until the young have undergone part or the whole of the metamorphosis.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "oviducts" in a variety of sentences. We hope that you will now be able to make sentences using this word.
