Which muscle opens the jaw?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the VetSkill Level 3 Diploma VN02 – Diagnostic Principles Test. Engage with multiple-choice questions, hints, and explanations. Achieve your certification!

Multiple Choice

Which muscle opens the jaw?

Explanation:
Opening the jaw is accomplished by depressor muscles of the mandible, with the anterior belly of the digastric acting as the main jaw opener. When this part of the muscle contracts, it pulls the mandible downward (especially when the hyoid is stabilized by other suprahyoid muscles), allowing the mouth to open. The other muscles listed are primarily involved in closing the jaw or guiding movement rather than depressing it: the masseter and temporalis are the primary jaw closers, and the pterygoids contribute to chewing and some jaw positioning rather than simple opening. So the digastric best fits the action of opening the jaw.

Opening the jaw is accomplished by depressor muscles of the mandible, with the anterior belly of the digastric acting as the main jaw opener. When this part of the muscle contracts, it pulls the mandible downward (especially when the hyoid is stabilized by other suprahyoid muscles), allowing the mouth to open. The other muscles listed are primarily involved in closing the jaw or guiding movement rather than depressing it: the masseter and temporalis are the primary jaw closers, and the pterygoids contribute to chewing and some jaw positioning rather than simple opening. So the digastric best fits the action of opening the jaw.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy