Oropharynx Flashcards

Study the oropharynx through its boundaries, tonsillar anatomy, muscular relationships, innervation, vascular supply, and swallowing functions.

Card 1 of 30Question

What is the oropharynx?

The middle division of the pharynx, serving as a common passage for air and swallowed material.

In This Section

1. What is the oropharynx?

The middle division of the pharynx, serving as a common passage for air and swallowed material.

2. Where is the oropharynx located?

Posterior to the oral cavity, between the nasopharynx and laryngopharynx.

3. What forms the superior boundary of the oropharynx?

The soft palate.

4. What marks the inferior boundary of the oropharynx?

The superior border of the epiglottis, approximately at the level of the hyoid bone.

5. Through which opening does the oral cavity communicate with the oropharynx?

The oropharyngeal isthmus, also called the isthmus of the fauces.

6. What forms the lateral boundaries of the oropharyngeal isthmus?

The paired palatoglossal arches.

7. What forms the inferior boundary of the oropharyngeal isthmus?

The dorsum of the tongue.

8. Which muscle forms the palatoglossal arch?

The palatoglossus muscle, covered by mucosa.

9. Which muscle forms the palatopharyngeal arch?

The palatopharyngeus muscle, covered by mucosa.

10. Where are the palatine tonsils located?

In the tonsillar fossae between the palatoglossal and palatopharyngeal arches.

11. Which muscle forms the principal muscular bed of the palatine tonsil?

The superior pharyngeal constrictor muscle.

12. What is the tonsillar capsule?

A fibrous connective tissue layer covering the deep surface of the palatine tonsil.

13. Which artery is an important source of blood supply to the palatine tonsil?

The tonsillar branch of the facial artery.

14. Which lymph nodes primarily receive lymphatic drainage from the palatine tonsils?

The jugulodigastric lymph nodes of the upper deep cervical group.

15. Where are the lingual tonsils located?

In the mucosa of the posterior third of the tongue.

16. What is Waldeyer's tonsillar ring?

A ring of lymphoid tissue formed by the pharyngeal, tubal, palatine, and lingual tonsils.

17. What type of epithelium predominantly lines the oropharynx?

Nonkeratinized stratified squamous epithelium.

18. Which cranial nerve provides the principal sensory innervation to the oropharynx?

The glossopharyngeal nerve (cranial nerve IX).

19. Which nerve provides motor innervation to most muscles of the oropharyngeal wall?

The vagus nerve (cranial nerve X) through the pharyngeal plexus.

20. Which pharyngeal muscle is an exception to vagus nerve motor innervation?

The stylopharyngeus muscle, supplied by the glossopharyngeal nerve.

21. Which pharyngeal constrictor muscles contribute to the walls of the oropharynx?

The superior and middle pharyngeal constrictors.

22. What is the main function of the pharyngeal constrictors during swallowing?

They contract sequentially to propel the food bolus inferiorly toward the esophagus.

23. Which arteries contribute to the blood supply of the oropharyngeal wall?

Branches of the ascending pharyngeal, facial, lingual, and maxillary arteries.

24. Where does venous blood from the oropharyngeal wall primarily drain?

Through the pharyngeal venous plexus into the internal jugular venous system.

25. Which lymph nodes receive much of the lymphatic drainage from the oropharynx?

The upper deep cervical lymph nodes.

26. What is the vallecula?

A mucosal depression between the base of the tongue and the anterior surface of the epiglottis.

27. Which structures separate the right and left epiglottic valleculae?

The median glossoepiglottic fold.

28. What is the afferent limb of the gag reflex elicited from the oropharynx?

The glossopharyngeal nerve (cranial nerve IX).

29. What is the efferent limb of the gag reflex?

The vagus nerve (cranial nerve X), supplying the pharyngeal muscles.

30. Why can pain from a palatine tonsil be referred to the ear?

Glossopharyngeal nerve sensory fibers supply both the tonsillar region and the middle ear.