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A Zenker's diverticulum, also pharyngeal pouch, is a diverticulum of the mucosa of the human pharynx, just above the cricopharyngeal muscle (i.e. above the upper sphincter of the esophagus). It is a pseudo diverticulum or false diverticulum (only involving the mucosa and submucosa of the esophageal wall, not the adventitia), also known as a ...
The third pouch possesses dorsal and ventral wings. Derivatives of the dorsal wings include the inferior parathyroid glands, while the ventral wings fuse to form the cytoreticular cells of the thymus. The main nerve supply to the derivatives of this pouch is cranial nerve IX, glossopharyngeal nerve.
Pharyngeal pouch can refer to: Zenker's diverticulum; Pharyngeal pouch (embryology) This page was last edited on 29 December 2019, at 18:29 (UTC). Text is available ...
I-IV pharyngeal arches, 1–4 pharyngeal pouches (inside) and/or pharyngeal grooves (outside) a Tuberculum laterale b Tuberculum impar c Foramen cecum d Ductus thyreoglossus e Sinus cervicalis. The pharyngeal apparatus is an embryological structure. [1] [2] It consists of: pharyngeal grooves (from ectoderm) pharyngeal arches (from mesoderm)
Rathke's pouch is a sac-like structure that gives rise to the pars distalis, pars intermedia, and pars tuberalis of the pituitary gland. The cells of Rathke's pouch proliferate and differentiate into various hormone-producing cells, including Somatotrophs , Lactotrophs , Corticotrophs , Thyrotrophs , and Gonadotrophs .
Pattern of the pharyngeal arches. I-IV pharyngeal arches, 1-4 pharyngeal pouches (inside) and/or pharyngeal grooves (outside) a Lateral lingual swellings b Median tongue bud c Foramen cecum d Thyroglossal duct e Cervical sinus. The median tongue bud (also tuberculum impar) marks the beginning of the development of the tongue.
Pharyngeal pouches develop into future parts in face and head. The pouches penetrate the surrounding mesenchyme but do not establish communication with the pharyngeal grooves. They appear simultaneously with the development of the arches. [7] The first pharyngeal pouch is characterized by narrowing at its final segment.
In vertebrates, Pax 1 and Pax 9 are expressed in the pharyngeal pouches and are important for thymus development. [14] Applying excess retinoic acid (excess retinoic acid in vertebrates results in pharyngeal abnormalities) leads to the absence of gill slits in developing amphioxi , suggesting that retinoic acid may act through the same ...