cloaca


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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 ?
The barium was visible throughout the entire gastrointestinal tract at 2 hours, with the exception of the cloaca (Fig 3A and B).
With all the mud and water, it was quite slippery so I wormed my way through this small passage called the Cloaca.
To see how it popped in and out of the alligator's body, she tugged on various tendons and muscles in the cloaca region and found one set of muscles that caused the penis to shoot out.
Detailed anatomical descriptions exist on the cloaca for all families of salamanders (Sever, 1991a).
23) A cloaca is not present in all cases of chronic osteomyelitis.
The allantois is an endermal diverticulum that communicates with the cloaca (hind-gut).
More accurate were his analyses of ancient technology: for instance, in the drawing of the Cloaca Maxima, he dissected the great sewer to make a picturesque masterpiece.
Guide to underground Rome; from Cloaca Massima to Domus Aurea; the most fascinating underground sites of the capital.
Males typically possess two conical papillae (1-3 mm) on each side of the cloaca that represent the termination of the vasa deferentia, while females are identified by presence of an oviductal opening (whitish in color) on the left side of the cloaca.
As a general rule, male turtles tend to have long tails whilst females have shorter, stumpy tails with the cloaca located closer to the body.
They are easily distinguished from males, which are smaller, sleeker and exude milt when gently pressed near the cloaca.
97) in adjacent tail height; originating almost below first sting origin; distance from cloaca to sting origin 1.