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 ?
Cloacal swabs in sterile specimen tubes were sent, at room temperature, to a reference laboratory (Veterinary Molecular Diagnostics, Milford, OH, USA) by overnight mail for M ornithogaster PCR analyses.
Por meio desses resultados de temperatura cloacal pode-se afirmar que os pintos de um dia passaram por um estresse por frio na sala de espera, aguardando o embarque no caminhao transportador.
Com essa imagem foi possivel diagnosticar as areas urbanizadas pertencentes a zona de recarga do Aquifero Arenito Basal Santa Maria que possuem rede coletora de esgoto cloacal e as areas que nao possuem.
En ambos casos, el mayor numero de aves positivas se encontro en las muestras de hisopado cloacal.
012%) cloacal swabs from apparently healthy live birds showed presence of Haemagglutinating virus.
Las diferencias entre la temperatura cloacal de lagartijas que viven en zonas bajas (750-1,100 m) y en zonas altas (1,100-1,400 m) entre diferentes microhabitats y entre los periodos de lluvias y secas fueron evaluadas con Analisis de Varianza (ANDEVA) de una via.
Stern BD, Kaplan L: Multicentric foci of carcinomas arising in structures of cloacal origin.
Two similar observational accounts of Coast Horned Lizard (P corn utum) copulation (Hewatt 1937, Milne 1938) also record the male's grasping of the female's horns in his mouth, and the upward twisting position of her posterior to meet the male's cloacal area.
05 mm) were identified as having a mental gland and relatively little cloacal pigmentation whereas females (38.
Young males of the bearded tit grow hardly any so-called cloacal protuberance when isolated from females, report Andreas Sax and Herbert Hoi of the Konrad Lorenz Institute for Comparative Ethology in Vienna in the October Auk.
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.