(redirected from cloacal membrane)
Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
According to them, an abnormal relationship exists between the lateral anlagen of the genital tubercle and the ventral end of the cloacal membrane. [1, 4, 6].
A misalignment between the termination of the cloacal membrane and its relationship with the developing genital tubercle and urogenital sinus has been reported (1).
The pharyngeal gut is separated from the primitive oral cavity by the buccopharyngeal membrane, whereas the foregut extends to the cloacal membrane that is the boundary between endoderm and ectoderm (1-9).