pharyngeal pouches


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pha·ryn·ge·al pouch·es

paired evaginations of embryonic pharyngeal endoderm, between the pharyngeal arches, extending toward the corresponding ectodermally lined pharyngeal grooves; during development they evolve into epithelial tissues and organs, such as thymus and thyroid glands.
Synonym(s): branchial pouches, endodermal pouches

pharyngeal pouches,

n.pl the four pairs of evaginations from the lateral walls lining the pharynx between the branchial arches in a developing embryo.
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References in periodicals archive ?
1-4) The arches are embryologically separated by 4 pharyngeal (or branchial) clefts laterally and 4 pharyngeal pouches medially.
Branchial cysts in two Amazon parrots (Amazona species)
1) The development of many structures in the head and neck is immediately related to either the branchial arches or the pharyngeal pouches.
Congenital familial bilateral branchial tracts: a rare case
Older theories hold that they are congenital abnormalities caused by an incomplete obliteration of pharyngeal pouches.
A case of papillary carcinoma arising in ectopic thyroid tissue within a branchial cyst with neck node metastasis
2) The thymus is derived from the third and fourth pharyngeal pouches.
Ectopic subglottic thymic cyst: a rare cause of congenital stridor

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