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invagination |
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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The thyroid gland develops from the median bud of the primitive pharynx at the base of the tongue, and it invaginates like a duct (the thyroglossal duct) caudally. Interiorly, the epithelium appeared to invaginate toward the posterior recess of the middle ear space. They subsequently invaginate centrally to become the nasal pits by the fifth week. |
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