Van Dyke, John H. Department of Anatomy, Hahnemann Medical College, Philadelphia, Pennsylvania.
- Location and structure
- Function and fate
- Additional Reading
Small, enigmatic structures which originate as terminal outpocketings from each side of the embryonic pharynx. They occur only in vertebrates, where they are almost universal but difficult to homologize. They probably represent an expression of continued growth activity caudally, associated with pouch- or gill-forming potentialities of foregut entoderm. They are usually bilateral in mammals. The last (and sometimes next to last) “true” pharyngeal pouch and ultimobranchial primordium often unite to form a combined entity known as a caudal pharyngeal complex. During development in humans, the ultimobranchial bodies may be intimately related to the third, as well as the fourth, pharyngeal pouch. Here, as in most mammals, this complex would be the fourth or last.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 10,000 highly qualified scientists and 45 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information