Anatomy of the Pharynx

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Questions and Answers

What is the length of the pharynx?

  • 10-12 cm
  • 18-20 cm
  • 12-14 cm (correct)
  • 15-17 cm

Which of the following bones is related to the superior end of the pharynx?

  • Parietal bone
  • Occipital bone
  • Frontal bone
  • Sphenoid bone (correct)

What is the width of the pharynx at its base?

  • 5.5 cm
  • 4.5 cm
  • 2.5 cm
  • 3.5 cm (correct)

Which of the following is NOT a feature of the nasopharynx?

<p>Palatine tonsil (D)</p> Signup and view all the answers

What is the function of the pharyngeal isthmus?

<p>Allows breathing through either the nose or the mouth (B)</p> Signup and view all the answers

Which of the following arteries supplies the palatine tonsils?

<p>All of the above (D)</p> Signup and view all the answers

What is the boundary between the nasopharynx and the oropharynx?

<p>Soft palate (C)</p> Signup and view all the answers

Which artery supplies the palatine tonsil?

<p>Ascending palatine artery (C)</p> Signup and view all the answers

What is the function of the constrictor muscles of the pharynx?

<p>Facilitate passage of food bolus inferiorly during deglutition (C)</p> Signup and view all the answers

Which nerve innervates the stylopharyngeus muscle?

<p>Glossopharyngeal nerve (D)</p> Signup and view all the answers

What is the location of the retropharyngeal lymph nodes?

<p>In the retropharyngeal space (B)</p> Signup and view all the answers

Which of the following muscles originates from the styloid process of the temporal bone?

<p>Stylopharyngeus (C)</p> Signup and view all the answers

What is the function of the superior constrictor muscle?

<p>Facilitate passage of food bolus inferiorly during deglutition (C)</p> Signup and view all the answers

Which of the following nerves is located between the digastric and stylopharyngeus muscles?

<p>Glossopharyngeal nerve (B), Glossopharyngeal nerve (D)</p> Signup and view all the answers

What is the origin of the palatopharyngeus muscle?

<p>Hard palate (B)</p> Signup and view all the answers

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Study Notes

Pharynx

  • Common passage for air and food
  • Extends between C1-C6 vertebrae, 12-15 cm long
  • Superior end of respiratory and digestive tube

Dimensions

  • Length: 12-14 cm
  • Width: 3.5 cm at base, 1.5 cm at pharyngo-esophageal junction

Relations

  • Superiorly: body of sphenoid, basilar portion of occipital bone
  • Anteriorly: communicates with nasal cavity, oral cavity, and larynx
  • Inferiorly: continuous with esophagus
  • Posteriorly: C1-C6, longus capitis, longus coli, prevertebral fascia

Nasopharynx

  • Located behind nasal cavity, above soft palate
  • Anteriorly: related to nasal cavity
  • Posteriorly: C1
  • Superiorly: base of skull
  • Inferiorly: oropharynx
  • Features: pharyngeal opening of auditory tube, tubal elevation, salpingopharyngeal fold, salpingopalatine fold, pharyngeal recess, pharyngeal tonsil

Pharyngeal Isthmus (Nasopharyngeal Isthmus)

  • An opening bounded by soft palate and posterior wall of pharynx (Passavant's ridge)

Oropharynx

  • Anteriorly: related to oral cavity
  • Posteriorly: level of body of C2 vertebra and upper part of C3
  • Superiorly: nasopharynx
  • Inferiorly: laryngopharynx
  • Features: palatine tonsils

Laryngopharynx

  • Extends from upper border of epiglottic cartilage to lower border of cricoid cartilage of larynx
  • Anteriorly: related to laryngeal inlet, posterior surface of arytenoid and cricoid cartilage of larynx
  • Posteriorly: C3-C6 vertebra
  • Superiorly: oropharynx
  • Inferiorly: esophagus

Muscles of Pharynx

  • 3 pairs of constrictor muscles: superior, middle, and inferior constrictors
  • 3 pairs of longitudinal muscles: stylopharyngeus, palatopharyngeus, salpingopharyngeus

Constrictor Muscles

  • Superior constrictor: originates from medial pterygoid plate, pterygomandibular raphe, mandible, and side of tongue
  • Middle constrictor: originates from greater and lesser horns of hyoid bone
  • Inferior constrictor: originates from thyroid and cricoid cartilage of larynx

Longitudinal Muscles

  • Stylopharyngeus: originates from styloid process of temporal bone
  • Palatopharyngeus: originates from posterior part of hard palate
  • Salpingopharyngeus: originates from cartilage of auditory tube

Retropharyngeal Lymph Nodes

  • Located in retropharyngeal space behind pharynx
  • Involved in drainage of lymph from several regions of head and neck

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