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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The CT scan portrayed the pharyngeal pouches to be 17 mm in diameter and arising between the hyoid bone and thyroid cartilage.
Also, several reports have demonstrated the coexistence of thymus and parathyroid glands in lateral cervical masses.[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?
Surgical interventions for pharyngeal pouch. Cochrane Database Syst Rev 2005;20(3):CD004459.
Two thymic primordia arise in the ventral wings of the third pharyngeal pouch. These paired structures normally lose their connection with the pharyngeal wall and descend along a path from the piriform sinus, through the thyrohyoid membrane, and along the carotid sheath bilaterally.
At this stage thymic and parathyroid primordia were seen as ventral and dorsal expansions from the ventral wall of 3rd pharyngeal pouch. Ventral thymic primordium was connected to the parathyroid primordium dorsally.
The surface epithelium and the lining of the tonsillar crypts of the tonsil develop from endoderm of the second pharyngeal pouch.
Ectopic cervical thymic cysts are believed to represent persistent tubular remnants of a third pharyngeal pouch (figure 4).
The thyroid diverticulum forms a bilobed structure, as it descends it fuses with the two lateral diverticula that are derived from the 4th pharyngeal pouch. As it advances caudally, it remains attached to pharyngeal wall by the thyroglossal duct (which obliterates on the 6th to 8th weeks of life).The thyroglossal duct descends caudally and anterior to the hyoid bone and larynx, reaching its location in the lower neck anterior to the thyroid cartilage and first few trachealrings (2).
Persistent pharyngeal pouch derivatives in the neonate.