Snook, Theodore Department of Anatomy, School of Medicine, University of North Dakota, Grand Forks, North Dakota.
- Palatine tonsil
- Lingual tonsil
- Pharyngeal tonsil
- Additional Reading
Localized aggregation of diffuse and nodular lymphoid tissue found in the region where the nasal and oral cavities open into the pharynx. The lymphoid tissue consists of small, closely packed round cells called lymphocytes supported in a specialized connective tissue framework called reticular tissue. When lymphocyte production is active, rounded and more densely packed clusters or nodules of these cells appear in the diffuse lymphoid tissue. The most active nodules possess lighter staining centers composed of somewhat larger, less densely packed lymphocytes showing evidence of cell division. Such areas are called germinal centers. In the tonsillar regions, the lymphoid tissue lies just beneath the lining epithelium. The tonsils are important sources of blood lymphocytes. They often become inflamed and enlarged, necessitating surgical removal.
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 9000 highly qualified scientists and 43 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