cloaca

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Related to cloacal: cloacal membrane

cloaca

(klōā`kə), in biology, enlarged posterior end of the digestive tract of some animals. The cloaca, from the Latin word for sewer, is a single chamber into which pass solid and liquid waste materials as well as the products of the reproductive organs, the gametes. Cloacas are found in amphibians, reptiles, birds, and lower mammals; higher mammals have a separate rectal outlet, the anus. The term cloaca is also used for analogous chambers in many invertebrates, such as worms of the phylum NematodaNematoda
, phylum consisting of about 12,000 known species, and many more predicted species, of worms (commonly known as roundworms or threadworms). Nematodes live in the soil and other terrestrial habitats as well as in freshwater and marine environments; some live on the deep
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.

Cloaca

 

the broadened extremity of the hindgut of some vertebrate animals. The wall of the cloaca is covered with a many-layered epithelium. The ureter, the genital ducts (sperm ducts or oviducts), and the urinary bladder open into the cloaca. It is found in certain cyclostomes (hagfish) and fishes (sharks, skates, dipnoans and pipefish) and in all amphibians, reptiles, and birds. The cloaca is found in mammals of the subclass Prototheria. In other mammals a cloaca is found only in the early embryonic stage of development; it subsequently divides into the urogenital sinus and the terminal part of the rectum, which have separate urogenital and anal openings. In amphibians the urinary bladder is formed from an evagination of the abdominal wall of the cloaca. Allantoides appear in the embryo of amniotes.

cloaca

[klō′ā·kə]
(invertebrate zoology)
The chamber which functions as a respiratory, excretory, and reproductive duct in certain invertebrates.
(vertebrate zoology)
The chamber which receives the discharges of the intestine, urinary tract, and reproductive canals in monotremes, amphibians, birds, reptiles, and many fish.

cloaca

An underground conduit for drainage; a sewer, esp. in ancient Rome.

cloaca

a cavity in the pelvic region of most vertebrates, except higher mammals, and certain invertebrates, into which the alimentary canal and the genital and urinary ducts open
References in periodicals archive ?
Molecular assay results for oral and cloacal swab samples and major organ and brain samples from falcon RW099878 were positive for influenza A and H5 viruses.
Emily Gullane was born with a complex condition called Cloacal
We measured or described wing chord length, size of cloacal protuberance or degree of brood patch development, fat condition, molt condition, and mass for each captured bird.
As observed in the gonoducts, great variation exists in the male cloaca of salamanders, and this variation is mainly due to the presence or absence of different cloacal glands.
Associated conditions of relevance to the abdominal procurement surgeon include anomalies of the renal veins (circum aortic renal collar, and retro aortic renal vein) (1), right retro caval ureter (3), horseshoe kidney, congenital right renal agenesis (4) and cloacal exstrophy (5).
1999; Schmidt-Rhaesa 2000, 2001; Schmidt-Rhaesa & Kristensen 2006; Schmidt-Rhaesa & Zaenker 2006 for SEM documentations) in having paired rows of cuticular bristles anterior of the ventral cloacal opening, bristles surrounding the cloacal opening and short spines on the ventral side of the tail lobes (Fig.
He has acongenital defect, cloacal exstrophy, in which an area of intestinal mucosa is interposed between two separate areas of urinary bladder
Differential diagnosis: incomplete duplication of the urinary bladder, urinary bladder diverticulum and cloacal malformation.
A temperatura cloacal tambem foi obtida semanalmente de quatro aves com auxilio de um termometro clinico veterinario com alarme sonoro indicador de estabilizacao de temperatura.
The width (lateral) and height (dorsoventral) of the cloacal gland were measured to the nearest 0.
Samples were collected from Cloacal swabs of chicken, intestinal fluid of chicken, egg surface, soil of chicken market and hand wash of chicken handlers from different poultry markets of Mohakhali, New market , Mirpur and Malibag of Dhaka city.