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invagination

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.03 sec.
invagination [in‚vaj·ə′nā·shən]
(embryology)
The enfolding of a part of the wall of the blastula to form a gastrula.
(physiology)
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.


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3) If, after reaching its most cephalic position, the notochord retains an attachment to the pharyngeal endoderm as it regresses toward the skull base, an invagination of the developing pharyngeal mucosa is created.
And just as truth remains elusive in the quest for a reconstructed historical record, so do membranes create doubt, in their bewildering multiplicity and forms, about what they essentially contain: "The more I attend to membranes, to folding and invagination, enclosure and layering, the less certain I become that there is a solid body inside the skin" (Elkins 1999:43).
It is largely skills-based, and therefore another statement of the paradigm shift is that of the invagination of the relationship between skills and knowledge.
 
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