Pharyngeal pouch (embryology)
|This article needs additional citations for verification. (April 2009)|
|Pattern of the branchial arches. I-IV branchial arches, 1-4 branchial pouches (inside) and/or pharyngeal grooves (outside)
a Tuberculum laterale
b Tuberculum impar
c Foramen cecum
d Ductus thyreoglossus
e Sinus cervicalis
|Floor of pharynx of human embryo about twenty-six days old.|
In the development of vertebrate animals, pharyngeal or branchial pouches form on the endodermal side between the branchial arches, and pharyngeal grooves (or clefts) form the lateral ectodermal surface of the neck region to separate the arches.
- 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.
- superior parathyroid glands and ultimobranchial body which forms the parafollicular C-Cells of the thyroid gland.
- Musculature and cartilage of larynx (along with the sixth pharyngeal pouch).
- Rudimentary structure, becomes part of the fourth pouch contributing to thyroid C-cells.
- Along with the fourth pouch, the contributes to the formation of the musculature and cartilage of the larynx.
- Swiss embryology (from UL, UB, and UF) rrespiratory/korperhohlen01 (Item #1 at Fig. 14)
- Embryology at Temple parch98/ARCHII97/sld017
- hednk-021 — Embryo Images at University of North Carolina
- hednk-022 — Embryo Images at University of North Carolina
- Outline at howard.edu (scroll down to "III. THE PHARYNGEAL POUCHES")