A student had his jaw locked while yawning. Which of the following muscles is attached to the articular disc of the temporomandibular joint?

Options

1. Lateral pterygoid
2. Temporalis
3. Medial pterygoid
4. Masseter

Correct Answer

Lateral pterygoid

Explanation

The lateral pterygoid muscle has two heads. The superior head inserts into the articular disc and capsule of the temporomandibular joint. During yawning or excessive mouth opening, spasm of the lateral pterygoid can lead to jaw locking (temporomandibular joint dislocation).

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