Explains tonsils as mucosa-associated lymphoid tissue ringing the entrances of the nasal and oral cavities, naming their lymphoid nodules and immune cells. It lists four types (palatine, pharyngeal, lingual and tubal) and then describes the structure layer by layer: crypts, surface epithelium that differs between oral and nasal tonsils, lymphoid follicles with germinal centres, connective tissue, and an incompletely formed capsule.
Topic 29 of 36 in the MU Sofia syllabus for Anatomy (Cardiovascular system) (Medicine, Year 2). The free AceMed note covers it in 2 sections, about 125 words (1 min of reading), with 14 flashcards.
In this note
TONSILS
Structure :
TONSILS
The tonsils are a type of mucosa associated lymphoid tissue (MALT) wich surrounded the opening of the nasal and oral cavities.
Contain lymphoid nodules wich contain T cells ,B cells and macrophages wich are key for immunological protection against any pathogens entering the pharynx.
There are 4 main types :
1. Palatine
2. Pharyngeal
3. linguinal
4. Tubal
Structure :
1. Crypts : invaginatins in the tonsil surface
Increasing surface area of the tonsils facilitating contact with pathogens .
2. Epithelium : Covers the surface
In oral cavity tonsils → stratified squamous epithelium
In nasal ″ ″ → Pseudostratified columnar epithelium .
3. Lymphoid follicles :
contain lymphocytes .
Contain Germinal centers
4. Connective tissue :
contain blood vessels and nerves .
5. Capsule : "Incompletly encapsulated"
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