The planula becomes elongated and broader towards one pole, at which a pit or invagination of the ectoderm arises. [Please select]
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ENTERITIS (OBSTRUCTION RESULTING FROM INVAGINATION, OR INTUSSUSCEPTION, TWISTING, AND KNOTTING OF THE BOWELS). [Please select]
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These two particular symptoms serve to distinguish this affection from enteritis and invagination of the bowel. [Please select]
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The invagination above the diaphragm, consisting of both endocyst and ectocyst, is then everted. [Please select]
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Foregut: extends from the mouth to the end of gizzard; its epithelium being formed from the ectodermal invagination known as the stomodaeum. [Please select]
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Invagination: a pouch or sac formed by an infolding or indrawing of the outer surface. [Please select]
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Proctodaeum: the invagination of epiblast that produces the anus and intestine as far forward as and including malpighian tubes. [Please select]
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