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 ?
Previous terminologies used were Ectopia of cloaca, Vesico-intestinal fissure, Exstrophy splanchna.
Se considero que los machos estaban estimulados por induccion hormonal, al hacer la observacion microscopica de espermatozoides en movimiento obtenidos de la region de la cloaca.
1 cm whitish, firm, nodular mass was observed in the lumen of the distal colon proximal to the cloaca.
Las lineas de escamas alrededor del cuerpo son 16 a la altura del cuello, 16 en la parte media y 12 en la region posterior, a una cabeza de distancia antes de la cloaca.
While Cloaca resembles an assembly line more than a person on the outside, the digestive process, controlled by a computer that the artist manipulates remotely via the Internet, is faithfully reproduced.
Reporte Indigo, que tan profesionalmente dirige Ramon Alberto Garza, es uno de los medios mas veraces del pais, destapo la cloaca que ha dado como resultado la publicacion de otras conversaciones indiscretas, lo que ha llevado a que otros funcionarios publicos hayan pedido la renuncia del secretario Tellez sin ponerse a pensar que muchos de ellos pueden tener cola que les pisen.
Sin duda, lo peor que les ha pasado es que Elba Esther Gordillo haya convertido al sindicato en una cloaca, un pozo de inagotable corrupcion donde ella hace lo que le viene en gana con millones de maestros dominados y con los muchos dineros que logran reunir con sus cuotas.
Vaccine efficacy was evaluated by protection from mortality, protection from morbidity, reductions in virus isolation from the respiratory tract, and reductions in virus isolation from the cloaca.
La profesora Elba Esther Gordillo tuvo un gran acierto, y es que con gran valentia y firmeza destapo la cloaca de como trabajan los coyotes para la asignacion de plazas en la SER durante la firma del Convenio de Alianza por la Calidad Educativa.
A cotton swab was inserted in the cloaca and the presence of a mass was suspected.
Con este principio juridico daremos seguimiento al feo asunto que comentaramos la semana pasada sobre la cloaca que es el Rio Santiago, podredumbre que circunda la zona metropolitana de Guadalajara, asunto que ha provocado que los funcionarios responsables busquen a quien culpar, en vez de reconocer sus faltas, sus omisiones y su negligencia.
5) Stomach Small Bird group (proventriculus) intestine Cloaca Racing pigeon 5-10 10-30 120-240 Study pigeon 0-30 15-30 60-480