pharyngeal pouch


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Related to pharyngeal pouch: Pharyngeal arches

pharyngeal pouch

[fə′rin·jē·əl ′pau̇ch]
(embryology)
One of the five paired sacculations in the lateral aspect of the pharynx in vertebrate embryos. Also known as visceral pouch.
References in periodicals archive ?
6-8] Because the parathyroid glands are derived from the dorsal wing of the third pharyngeal pouch and descend with the thymus, an ectopic thymus-parathyroid complex mechanistically suggests aberrant migration.
Pharyngeal pouch carcinoma: real or imaginary risks?
1) As a derivative of the third pharyngeal pouch, thymic remnants may occur at any point along the path of descent of the thymus into the mediastinum during embryologic development.
The paired epithelial primordia of thymus develop from the ventral part of 3rd pharyngeal pouch along with inferior parathyroid primordia in the region of superior neck in early fetal life.
Finally, it opens internally in the tonsillar fossa in case of second pharyngeal pouch, into larynx in case of third pharyngeal pouch, into pyriform fossa in case of fourth pharyngeal pouch.
C cells arise from the ultimobranchial body, which is derived from the fourth pharyngeal pouch, and they are found in the upper and middle areas of the thyroid lobes.