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?
Name the tonsils.
Palatine, Pharyngeal (Adenoid), Lingual.
What are tonsils?
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Where is the Pharyngeal tonsil located?
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What type of epithelium does the Pharyngeal tonsil have?
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What is the blood supply for the Pharyngeal tonsil?
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What is the innervation of the Pharyngeal tonsil?
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Where is the Palatine tonsil located?
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What type of epithelium does the Palatine tonsil have?
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What is the lymphatic drainage of the Palatine tonsil?
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Describe the crypts of the Palatine tonsil.
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Where is the Lingual tonsil located?
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What type of epithelium does the Lingual tonsil have?
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What is the blood supply for the Lingual tonsil?
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What is the innervation of the Lingual tonsil?
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What is Waldeyer's Ring?
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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.
