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 ?
2007) submeteram frangos de corte a temperaturas ciclicas elevadas e concluiram que houve aumento da frequencia respiratoria e da temperatura cloacal e que esses mecanismos sao os principais meios utilizados para dissipacao de calor por evaporacao nas aves.
En cuanto a la regulacion de la glandula cloacal por el fotoperiodo, Sachs (1967) trabajo con cinco grupos diferentes de codornices japonesas macho.
antonii, donde las hembras y machos presentan diferencias morfometricas en la longitud rostro cloacal y peso (Vitt et al.
Nasal and cloacal bacteria in free-ranging desert tortoises from the western United States.
Although slight differences existed in the banding pattern between this last patient and the cloacal sample from the turtle, epidemiologic and laboratory evidence supported the conclusion that the illnesses in all four cases were the result of contact with turtles.
These benign glands were immunohistochemically negative for CEA and p-53 antigens (Fig 2, c) and were presumably cloacal remnants.
Female cloacal anatomy of Plethodon cinereus and Plethodon dorsalis (Amphibia: Plethodontidae).
It was he who made the link between the nether world, the stricken physiology, the dangerous sexuality, and the forbidden independence of prostitutes with the cloacal rot deep beneath the streets of the city.
The reaction of the fire ant workers to a blind snake included aggitatedly running away from the snake (a local or nest-wide response, or both), attacks by small numbers of workers, attacks by large numbers of workers that abated after the snake coiled and evacuated its cloacal sac, biting or stinging (especially at the head and tail region of the snake), and riding on the snake after coiling and cloacal sac evacuation without attempting to bite or sting.
Lourdes Socorro, Dumaguete city veterinarian, said they had collected blood samples and cloacal swabs from the chickens and would submit them for testing at the Department of Agriculture laboratory in Dumaguete City.
The cloacal swab samples were collected from feral and racing pigeons to find a C psittaci field strain.