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The condition of an invaginated organ or part.

Relating to the archenteron; as, archenteric invagination.

nteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.

The pore or opening leading into the cavity of invagination, or archenteron.

Pushing or growing in; -- said of a kind of invagination. See under Invagination.

Embolic invagination. See under Invagination.

Growing or covering over; -- said of a kind of invagination. See under Invagination.

Epibolic invagination. See under Invagination.

A cavity formed by the invagination of the outer wall of the body, as the atrium of an amphioxus and possibly the body cavity of vertebrates.

An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illu…

The process of invagination, in embryonic development, by which a gastrula is formed.

ion or slipping of the upper part of the small intestine into the lower; introsusception; invagination. Dunglison.

he cavity of the mouth, and the proctod, a part at the posterior end, which are formed by invagination and are lined with epiblast.

in which the mesoblast is formed lies between the entoblast and ectoblast. See Illust. of Invagination. -- Segmentation nucleus (Biol.), the body formed by fusion of the male and female pronucleus in an impregnated ovum. See the Note under Pronucleus. -- Segmentation of the ovum, or Egg cleavage (Biol.), the process…