Cl, cloacal or pallial chamber of Neomeniae and Chaetoderma.
The segmental ducts in the larv open behind into the cloacal section of the alimentary tract.
The cloacal involution, relatively to the cloaca, recedes backwards.
It soon acquires a lumen, and joins the cloacal section of the alimentary tract before the close of fœtal life.
The male continues to flutter his wings to maintain balance throughout the two seconds of cloacal contact.
From the duodenum the small intestine or ileum extends with many convolutions to its exit through the cloacal aperture.
It gives rise to the cloacal and intestinal part of the alimentary tract.
On the intestine near the cloacal opening note a pair of glandular structures, the cca.
The other pair lies just within the lips of the cloacal opening.
Elsewhere the wall of the cloaca and cloacal groove are merely in contact but do not communicate.
1650s, euphemism for "underground sewer," from Latin cloaca "public sewer, drain," from cluere "to cleanse," from PIE root *kleue- "to wash, clean" (cf. Greek klyzein "to dash over, wash off, rinse out," klysma "liquid used in a washing;" Lithuanian šluoju "to sweep;" Old English hlutor, Gothic hlutrs, Old High German hlutar, German lauter "pure, clear"). Use in biology, in reference to eliminatory systems of lower animals, is from 1834. Related: Cloacal (1650s); cloacinal (1857).
cloaca clo·a·ca (klō-ā'kə)
In early embryos, the entodermally lined chamber into which the hindgut and allantois empty.
The common cavity into which the intestinal, genital, and urinary tracts open in vertebrates such as fish, reptiles, birds, and some mammals.
An opening in a diseased bone containing a fragment of dead bone.
Plural cloacae (klō-ā'sē')