Oropharyngeal Anatomy Flashcards

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Questions and Answers

What is the Isthmus Facium and where is it located?

Oropharyngeal isthmus, which is the opening of the oropharynx directly behind the oral cavity.

What are the boundaries of the Oropharyngeal Isthmus?

Palatoglossal arches (correct)

Tongue (correct)

Soft palate (correct)

Pharyngeal wall

Name the tonsils.

Palatine, Pharyngeal (Adenoid), Lingual.

What are tonsils?

Large collections of lymphoid tissue in the mucosa of pharyngeal wall. Signup and view all the answers

Where is the Pharyngeal tonsil located?

Roof of the nasopharynx. Signup and view all the answers

What type of epithelium does the Pharyngeal tonsil have?

Pseudostratified ciliated columnar epithelium Signup and view all the answers

What is the blood supply for the Pharyngeal tonsil?

Branches of external carotid artery, specifically the tonsillar branch of facial and lingual artery. Signup and view all the answers

What is the innervation of the Pharyngeal tonsil?

Tonsillar branches of glossopharyngeal IX nerve. Signup and view all the answers

Where is the Palatine tonsil located?

Each side of the oropharynx, between palatoglossal and palatopharyngeal arches. Signup and view all the answers

What type of epithelium does the Palatine tonsil have?

Stratified squamous epithelium Signup and view all the answers

What is the lymphatic drainage of the Palatine tonsil?

Jugulodigastric (tonsillar) lymph node. Signup and view all the answers

Describe the crypts of the Palatine tonsil.

10-12 in number, filled with cheesy/pus-looking material (food debris, bacteria, etc). Signup and view all the answers

Where is the Lingual tonsil located?

Posterior 1/3 of the tongue. Signup and view all the answers

What type of epithelium does the Lingual tonsil have?

Stratified squamous epithelium Signup and view all the answers

What is the blood supply for the Lingual tonsil?

Tonsillar branch of the facial artery - branch of external carotid. Signup and view all the answers

What is the innervation of the Lingual tonsil?

Tonsillar branch of glossopharyngeal IX nerve. Signup and view all the answers

What is Waldeyer's Ring?

It refers to the ring of lymphoid tissue, including the tonsils, that encircles the nasopharynx. Signup and view all the answers

Study Notes

Isthmus Faucium

Oropharyngeal isthmus connects the oral cavity to the oropharynx.
Located directly behind the oral cavity; serves as an important passageway.

Boundaries of Oropharyngeal Isthmus

Superior boundary: Soft palate.
Lateral boundaries: Palatoglossal arches.
Inferior boundary: Tongue.

Tonsils

Types of tonsils:
- Palatine tonsils
- Pharyngeal tonsils (also known as adenoids)
- Lingual tonsils.

Function of Tonsils

Composed of large collections of lymphoid tissue found in the mucosa of the pharyngeal wall.
Act as immune defense by responding to pathogens.

Pharyngeal Tonsil

Location: Roof of the nasopharynx.
Epithelium: Respiratory epithelium, predominantly pseudostratified ciliated columnar.
Blood supply:
- Main supply from tonsillar branch of the facial artery.
- Additional supply from lingual artery and ascending pharyngeal branch of the external carotid artery.
Innervation: Tonsillar branches of the glossopharyngeal (IX) nerve.

Palatine Tonsil

Location: Located bilaterally in the oropharynx, between the palatoglossal and palatopharyngeal arches.
Epithelium: Stratified squamous epithelium.
Blood supply:
- Main supply from the tonsillar branch of the facial artery.
- Additional supply from the external carotid artery.
Innervation:
- Tonsillar branch of the lesser palatine nerve (maxillary V2 branch).
- Also receives innervation from tonsillar branches of the glossopharyngeal (IX) nerve.
Lymphatic drainage: Jugulodigastric (tonsillar) lymph node.

Crypts of the Palatine Tonsil

Typically 10-12 crypts present.
Crypts contain cheesy or pus-like material, which is a mix of food debris and bacteria.

Lingual Tonsil

Location: Found at the posterior one-third of the tongue.
Epithelium: Stratified squamous epithelium.
Blood supply: Primarily from the tonsillar branch of the facial artery, which arises from the external carotid artery.
Innervation: Tonsillar branch of glossopharyngeal (IX) nerve.

Waldeyer's Ring

Functions as a protective ring of lymphoid tissue, comprised of tonsils forming a barrier against pathogens entering through the oral and nasal cavities.

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Description

Test your knowledge on the anatomy of the oropharynx and tonsils with these flashcards. Explore key concepts such as the oropharyngeal isthmus and the boundaries surrounding it. Learn about different types of tonsils and their functions in the immune system.