Mandibular Depressors — NDEB AFK MCQ

Instant feedback + full explanation. One question, done properly.

EasyBiomedical SciencesMandibular DepressorsNDEB AFK

Which muscle is the primary depressor of the mandible during mouth opening?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: C — Lateral pterygoid

The lateral pterygoid (inferior head) is the primary muscle initiating mouth opening by pulling the condyle and articular disc anteriorly. The digastric, mylohyoid, and geniohyoid assist but are considered accessory. The masseter, medial pterygoid, and temporalis are elevators (closers) of the mandible.

Reference: Okeson – Management of Temporomandibular Disorders, 8th ed., 2019