Anatomy & Histology · single question
Which muscle RETRUDES (draws back) the mandible?
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Correct answer: D. Posterior fibers of the TEMPORALIS muscle
✓ D) Posterior fibers of the temporalis muscle are responsible for mandibular RETRUSION.
Temporalis muscle: ANTERIOR fibers = elevation; POSTERIOR fibers = RETRUSION/retraction of mandible. This is a classic exam question. The temporalis is fan-shaped; posterior fibers run horizontally → pull condyle posteriorly. Clinical relevance: bruxism with posteriorly positioned condyle compresses retrodiscal tissue (bilaminar zone) → pain and TMJ damage. The lateral pterygoid inferior head = protrusion + opening. Masseter = elevation. Medial pterygoid = elevation + protrusion.
Temporalis muscle: ANTERIOR fibers = elevation; POSTERIOR fibers = RETRUSION/retraction of mandible. This is a classic exam question. The temporalis is fan-shaped; posterior fibers run horizontally → pull condyle posteriorly. Clinical relevance: bruxism with posteriorly positioned condyle compresses retrodiscal tissue (bilaminar zone) → pain and TMJ damage. The lateral pterygoid inferior head = protrusion + opening. Masseter = elevation. Medial pterygoid = elevation + protrusion.
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