| 释义 |
cloacaenUK
clo·a·ca C0412300 (klō-ā′kə)n. pl. clo·a·cae (-sē′) 1. A sewer or latrine.2. Zoology a. The common cavity that serves as the opening for the intestinal, genital, and urinary tracts in many vertebrates, including amphibians, reptiles, birds, monotremes, and some fishes.b. The posterior part of the intestinal tract in various invertebrates.
[Latin cloāca, sewer, canal.]
clo·a′cal (-kəl) adj.cloaca (kləʊˈeɪkə) n, pl -cae (-kiː) 1. (Zoology) 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 open2. a sewer[C18: from Latin: sewer; related to Greek kluzein to wash out] cloˈacal, cloˈacaline, ˌcloaˈcinal adjclo•a•ca (kloʊˈeɪ kə)
n., pl. -cae (-sē). 1. a. the common cavity into which the intestinal, urinary, and generative canals open in birds, reptiles, amphibians, many fishes, and certain mammals. b. a similar cavity in invertebrates. 2. a sewer, esp. an ancient sewer. [1650–60; < Latin clo(u)āca, cluāca sewer, drain] clo•a′cal, adj. clo·a·ca (klō-ā′kə) The body cavity into which the intestinal, urinary, and genital canals empty in birds, reptiles, amphibians, most fish, and the primitive mammals known as monotremes. The cloaca has an opening for expelling its contents from the body.Thesaurus| Noun | 1. | cloaca - (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts openbodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the bodyzoological science, zoology - the branch of biology that studies animals | | 2. |  cloaca - a waste pipe that carries away sewage or surface watersewer, seweragedrainpipe, waste pipe, drain - a pipe through which liquid is carried awaysewage system, sewage works, sewer system - facility consisting of a system of sewers for carrying off liquid and solid sewage |
TranslationscloacaenUK
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
..... Click the link for more information. .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. cloacaAn 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 cloacaenUK
cloaca [klo-a´kah] (pl. cloa´cae) (L.) 1. a common passage for fecal, urinary, and reproductive discharge in most lower vertebrates.2. in mammalian embryos, the terminal end of the hindgut before division into rectum, bladder, and the primordia of the organs" >reproductive organs.3. an opening in the covering or sheath of a necrosed bone. adj., adj cloa´cal.clo·a·ca (klō-ā'kă), 1. In early embryos, the endodermally lined chamber into which the hindgut and allantois empty. 2. In birds and monotremes, the common chamber into which open the hindgut, bladder, and genital ducts. [L. sewer] cloaca (klō-ā′kə)n. pl. cloa·cae (-sē′) Zoology a. The common cavity that serves as the opening for the intestinal, genital, and urinary tracts in many vertebrates, including amphibians, reptiles, birds, monotremes, and some fishes.b. The posterior part of the intestinal tract in various invertebrates.
clo·a′cal (-kəl) adj.cloaca Embryology
The terminal hindgut before it divides into the rectum, bladder and genital primordia.
Pathology
An obsolete term for an opening in the involucrum of necrotic bone.
Zoology
A common conduit in most lower vertebrates for faecal, urinary and reproductive discharge.clo·a·ca, pl. cloacae (klō-ā'kă, -sē) 1. In early embryos, the endodermally lined chamber into which the hindgut and allantois empty. 2. In birds and monotremes, the common chamber into which the hindgut, bladder, and genital ducts empty. [L. sewer]cloaca The combined urinary and faecal opening in the embryo before the two become separated. The term derives from the Latin cloaca a sewer.cloaca the terminal part of the gut system of most vertebrates (except higher mammals) into which the ducts from the kidney and reproductive system open. In these types there is thus only one posterior aperture to the body as compared with two in mammals, the anus and the opening of the urinogenital system. In some vertebrates, such as birds, the cloaca is reversible and forms a penis-like structure in the males during copulation.cloacaenUK
Synonyms for cloacanoun (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts openRelated Words- bodily cavity
- cavum
- cavity
- zoological science
- zoology
noun a waste pipe that carries away sewage or surface waterSynonymsRelated Words- drainpipe
- waste pipe
- drain
- sewage system
- sewage works
- sewer system
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