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a bilaminar (ectoderm and endoderm) membrane derived from the prechordal plate; after the embryonic head fold has evolved it lies at the caudal limit of the stomodeum.
oropharyngeal membraneA transient ectodermal membrane formed in embryos where the anterior aspect of the primitive gut contacts the abdominal wall, separating the depression of the stomadeum from the primitive pharynx. The membrane completely disappears by the 4th week, leading to communication between the stomadeum and pharynx.
buc·co·pha·ryn·ge·al mem·brane(bŭkō-făr-injē-ăl membrān)
pertaining to the mouth and pharynx. Called also O/P.
a transient embryonic membrane which separates the stomodeum from the pharyngeal cavity in the early fetus. Called also oral plate.