Pharyngeal pouch (embryology)
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(Redirected from Branchial pouch)
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| Pharyngeal pouch | |
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| 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 |
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| Floor of pharynx of human embryo about twenty-six days old. | |
| Latin | sacci pharyngei |
| Gray's | subject #13 65 |
| Carnegie stage | 10 |
| Code | TE E5.4.2.0.0.1.1 |
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 pouches line up with the clefts,[1] and these thin segments become gills in fish.
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[edit] Specific pouches
[edit] First pouch
The endoderm lines the future auditory tube (Pharyngotympanic " Eustachian " tube) , middle ear, mastoid antrum, and inner layer of the tympanic membrane. & origin of Mandibular nerve & Maxillary artery.
[edit] Second pouch
- Contributes to the middle ear, palatine tonsils, supplied by the facial nerve.
[edit] Third pouch
- 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.
[edit] Fourth pouch
Derivatives include:
- 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).
[edit] Fifth pouch
- Rudimentary structure, becomes part of the fourth pouch contributing to thyroid C-cells.[2]
[edit] Sixth pouch
- Along with the fourth pouch, contributes to the formation of the musculature and cartilage of the larynx.[3]
[edit] See also
[edit] References
- ^ "pharyngeal pouch" at Dorland's Medical Dictionary
- ^ Endocrine Glands
- ^ Carlson, Bruce (2004). Human Embryology and Developmental Biology. Elsevier Mosby. ISBN 978-0-323-03649-8.
[edit] External links
- Swiss embryology (from UL, UB, and UF) rrespiratory/korperhohlen01 (Item #1 at Fig. 14)
- Embryology at Temple parch98/ARCHII97/sld017
- hednk-021 — Embryology at UNC
- hednk-022 — Embryology at UNC
- Outline at howard.edu (scroll down to "III. THE PHARYNGEAL POUCHES")
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