Station 3: The Pharynx Flashcards Preview

CAM201: Anat/Histo Prac 3 > Station 3: The Pharynx > Flashcards

Flashcards in Station 3: The Pharynx Deck (12)
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Where does the pharynx extend from (vertebral levels)?

The base of the skull to vertebral level C6/7 (the level of the junction of the larynx and the trachea)


What are the 3 subdivisions of the pharynx? What does each conduct?

Naso-, Oro-, and Laryngo-pharynx

All three conduct air, the latter 2 also conduct fod


Where does the Eustachian Tube open? Where does it come from? What is its function? What problems can happen with it?
Other names for it?

Opens in nasopharynx.

Comes from the middle ear.

Pressure equalization and drains mucous from ear into nasopharynx

Infection can easily spread from nasopharynx to the nasopharynx. Especially in younger children as their eustachian tubes are so thin.

AKA the auditory tube


What is the lymphoid tissue in the pharynx called?

MALT. Mucosa Associated Lymphoid Tissue.


What is a Mucosa?

Mucosas cover epitheliums that are involved in absorption and/or secretion.

Glands in the submucosa secrete mucous onto mucosal surface, and glands in the epithelium (e.g. goblet cells) also secrete mucous. Usually have a ciliated epithelium to move particulate or other matter through the mucous.


What are tonsils? Their finction

Tonsils are non-encapsulated aggregations of lymphocytes.


Function: Large aggregations can act much the same way as a lymph node in that they can form germinal centres and have discrete B and T cell zones, and mount both humoral and cell mediated responses to antigenic stimulation


Describe the arrangement of the tonsils in the pharynx. What is the name of this arrangement? Which tonsils are involved?

Waldeyer's Ring

The tonsils form a 'ring' of lymphatic tissue aroung the posterior openings of the oral and nasal cavities into the pharynx.

This is part of the MALT

Consists of the palatine, linguinal and pharyngeal tonsils.


Describe the number of, the epithelium of, number of crypts, and the location of the Palatine Tonsils

2 of them

Stratified Squamous

10-20 Crypts

Located between the palatoglossal and palatopharyngeal arches


Linguinal tonsil(s): Number of, epithelium, crypts, location

Numerous linguinal tonsils

Stratified Squamous

1 crypt

On surface of posterior 1/3 of th tongue


Pharyngeal tonsil(s): number of, epithelium, crypts, location

1 of them

Respiratory Epithelium

Have folds which may resemble Crypts

Located in the roof of the nasopharynx


What are the functions of tonsilar crypts?

Crypts are crevasses in the tonsils. They reach through almost the full thickness of the tonsil. Functionally, they massively increase the surface area of the tonsils, maximising its immune function - greater contact between environmental influences and the lymphoid tissue


Look at the tonsil slides