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The enfolding of a part of the wall of the blastula to form a gastrula.
The act of ensheathing or becoming ensheathed.
The process of burrowing or enfolding to form a hollow space within a previously solid structure, as the invagination of the nasal mucosa within a bone of the skull to form a paranasal sinus.



(1) In embryology, in-pouching, one of the processes of gastrulation, in which part of the wall of the embryo turns into its cavity and forms an inner layer, called the primitive entoderm.

(2) In medical practice, a form of intestinal obstruction in which a section of the gut works its way into (usually) a lower section, producing blockage of the lumen of the intestine. It is most often found in children.

References in periodicals archive ?
oblique as a wit among invaginate flowers, insinuating aerial sex, seminal by proxy, emperors without politics or empire, flying upwind towards the scent of females equally old and caught, driven by metaphoric miracles.
Costus spicatus is an herbaceous species with a hard stem, alternate, invaginate, dark green, hairy leaves and yellow flowers with crimson-colored bracts (Campos et al.
The root hair walls tend to invaginate in contact with these hyphae, which display altered morphology typical of Hartig net hyphae (Kottke & Oberwinkler, 1986a, 1986b).
They skirt the outer margins of the lung and may invaginate.
Bone wax was gently placed over the cartilage and round window niche (figure 4, B), and care was taken not to invaginate the round window membrane.