One of the mysteries of the English language finally explained.
nounmass nounAnatomy Biology
1The action or process of being turned inside out or folded back on itself to form a cavity or pouch.
- ‘This indicates a level of plasma membrane invagination comparable with mammalian skeletal muscle.’
- ‘Specifically, the ventral invagination and migration of mesodermal precursors in the embryo are severely impaired, as are head involution, dorsal closure, and the migration of gonadal precursors.’
- ‘Catheters with multiple side holes on several planes are less likely to cause invagination of airway mucosa into the catheter than those with single side or end holes.’
- ‘The initial conditions for the appearance of feathers also probably resides in processes common to all ammonites and include placode formation, invagination, and mesenchymal-epithelial interactions.’
- ‘In the chick embryo, for example, the ectoderm initially expresses L-CAM; during neural plate invagination, however, L-CAM expression is replaced by that of N-cadherin.’
- 1.1count noun A cavity or pouch so formed.
- ‘There is a refracting secretion in the space of this invagination presumably protecting the photoreceptor cells.’
- ‘These invaginations represent placental outgrowths and they extend towards the centre, enclosing the central hole into a triangular slit.’
- ‘The internodes have invaginations that are termed cupules.’
- ‘As is typical, many of the latter showed reactive changes, such as large, variably sized nuclei; intranuclear invaginations; and multinucleation.’
- ‘Intranuclear cytoplasmic invaginations, similar to that seen in non-neoplastic hepatocytes (or in metastatic melanoma) are also frequent.’
Mid 17th century: from modern Latin invaginatio(n-), based on in- ‘into’ + Latin vagina ‘sheath’.
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