cloacal membrane


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clo·a·cal mem·brane

a transitory membrane in the caudal area of the embryo, separating the proctodeum from the cloaca; it is divided into anal and genitourinary membranes that break down during the eighth to ninth week of human development to establish the external opening for the alimentary and genitourinary tracts.

cloacal membrane

[klō·ā′kəl]
a thin sheath that separates the internal and external portions of the cloaca in the developing embryo. It is formed from endoderm and ectoderm and closes the fetal anus during early prenatal development; it later ruptures and is absorbed so that the anal canal becomes continuous with the rectum. Also called anal membrane.

clo·a·cal mem·brane

(klō-ā'kăl mem'brān)
A transitory membrane in the caudal area of the ventral wall of the embryo, separating the endodermal from the ectodermal cloaca; it is divided into anal and genitourinary membranes that break down during the eighth to ninth weeks to establish the external opening for the alimentary and genitourinary tracts.

cloacal

emanating from or pertaining to cloaca.

cloacal kiss
the contact which occurs during insemination in birds when the vent of the female is everted exposing the cloacal mucosa against which the phallus of the male is pressed.
cloacal membrane
caudal boundary of the cloaca; membranous in the embryo, ruptured during organogenesis.