Which muscle, as shown in the diagram, attaches to the cartilaginous portion of the Eustachian tube and also blends with the soft palate?

1. A

   Stylopharyngeus

2. B

   Tensor veli palatini

3. C

   Levator veli palatini

4. D

   Palatopharyngeus

Appeared in: NORCET 1 - 2020

Explanation

• The muscle indicated in the diagram and described in the question is the Levator veli palatini.
• It originates from the base of the skull (petrous temporal bone) and the cartilage of the Eustachian tube.
• It inserts into the soft palate, forming a sling that elevates the palate upon contraction.
• This elevation is critical for closing the nasopharynx during swallowing, preventing nasal regurgitation.

Why Other Options Were Wrong

• Option A: Stylopharyngeus originates from the styloid process and inserts on the pharynx to elevate it; it does not attach to the soft palate or Eustachian tube.
• Option B: Tensor veli palatini primarily tenses the soft palate and opens the Eustachian tube. The muscle shown is a sling-like elevator, which is characteristic of the Levator veli palatini.
• Option D: Palatopharyngeus is a longitudinal muscle of the pharynx that originates from the palate. It does not originate from the Eustachian tube.

Related Visual

• Visual 1: Labeled Diagram - A clear diagram showing the five muscles of the soft palate (Levator veli palatini, Tensor veli palatini, Palatoglossus, Palatopharyngeus, Musculus uvulae) with their origins and insertions.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the muscles of the soft palate and pharynx as background academic context rather than a clinical decision trigger.
• Paralysis or weakness of the Levator veli palatini, often due to nerve damage (pharyngeal plexus, CN X), can lead to incomplete closure of the nasopharynx.
• This results in nasal regurgitation, where food or liquid comes out of the nose during swallowing, and a hypernasal voice quality.
• What if? - If a patient has a cleft palate, the Levator veli palatini muscle may not have a proper insertion point, leading to similar issues with speech and swallowing. Surgical repair aims to reconstruct the muscular sling to restore function.

How to Approach the Question

• First, carefully examine the anatomical diagram and identify the structure indicated by the arrow.
• Read the question stem to understand the specific characteristics you need to match, in this case, the muscle's attachments (Eustachian tube and soft palate).
• Correlate the visual information from the diagram with the description in the stem.
• Evaluate each option based on your knowledge of the anatomy of the region.
• Eliminate options that do not match the location, attachments, or function of the indicated muscle.
• Select the option that accurately names the muscle shown and described.

Concept Tested & Keywords

• Concept Tested: Anatomy of the muscles of the soft palate and pharynx.
• Stem keywords: muscle, diagram, Eustachian tube, soft palate
• Lead-in keywords: Which
• Clinical cues: Anatomical diagram with a pointer
• Clinical cues: Description of muscle attachments

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