Sources
open directory project
Help build the largest human-edited directory on the web.
Submit a site - Become an editor
Wikipedia. Licensed under the GNU Free Documentation License.
Are you an expert in this subject? Join the discussion and share your knowledge at Wikipedia.org.
Branchial pouch
From Wikipedia, the free encyclopedia
(Redirected from Branchial pouches)
| Branchial pouch | ||
|---|---|---|
 |
||
| 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. | ||
| Gray's | subject #13 65 | |
| Carnegie stage | 10 | |
| Dorlands/Elsevier | p_31/12662655 | |
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 from the lateral ectodermal surface of the neck region to separate the arches. The pouches line up with the clefts, and these thin segments become gills in fish.
Contents |
This is the only pouch in which the endoderm and ectoderm remain close together, as the tympanic membrane. There is minimal mesoderm in the tympanic membrane.
- The endoderm lines the future auditory tube, middle ear, mastoid antrum, and inner layer of the tympanic membrane.
- The ectoderm lines the future external acoustic meatus and outer layer of the tympanic membrane.
- Mesoderm remains as the middle portion of the tympanic membrane, where the endoderm of the first pharyngeal pouch and the ectoderm of the first pharyngeal cleft have met.
- Contributes to the middle ear, tonsils, supplied by the facial nerve.
- The third pouch possesses Dorsal and Ventral wings. Derivatives of Dorsal 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.
- Derivatives include the superior parathyroid gland and parafollicular C-Cells of the thyroid gland.
- Rudimentary structure, becomes part of the fourth pouch contributing to thyroid C-cells.
- Swiss embryology (from UL, UB, and UF) rrespiratory/korperhohlen01 (Item #1 at Fig. 14)
- Embryology at Temple parch98/ARCHII97/sld017
- Embryology at UNC hednk-021
- Outline at howard.edu (scroll down to "III. THE PHARYNGEAL POUCHES")
|
|
|
|---|---|
| Branchial region | Branchial arch (1st/Meckel's cartilage, 2nd)/Branchial pouch - Cervical sinus - Lateral lingual swelling - Tuberculum impar - Frontonasal prominence - Olfactory pit - Nasal processes - Globular process - Primitive palate - Maxillary prominence |
| Tooth development | Dental papilla - Odontoblast - Ameloblast |
| Other | Thyroglossal duct |