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NEET MDS Quiz - Practice Test
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Anatomy - 3 Questions

1
Anatomy

Which of the following muscles has two separate functions in mandibular movement

1) Masseter
2) Geniohyoid
3) External(lateral)pterygoid
4) Buccinator

📝 Explanation:

The external (lateral) pterygoid muscle has two primary functions: it assists in depressing the mandible (opening the mouth) and in moving the mandible forward (protrusion). This dual function distinguishes it from other muscles of mastication, which primarily elevate the mandible.

2
Anatomy
Gag reflex is lost due to paralysis 1. V th nerve 2. VII th nerve 3. IX th nerve 4. XII nerve

📝 Explanation:

Gag reflex is lost due to paralysis IX Nerve The pharyngeal branch of IX nerve supply the mucosa of pharynx

3
Anatomy
Main function of both lateral pterygoids acting together is
1) Elevation of niandlble
2) Depression of mandible
3) Side to side movement
4) Prutrusion of mandible

📝 Explanation:

Lateral pterygoid (paired action):

When both muscles contract together, they pull the condyles and articular discs forward → protrusion of the mandible.

This is important in opening the mouth beyond the initial hinge movement.

Unilateral contraction:

Produces side-to-side (lateral) movements of the mandible, useful in grinding food.

Elevation/Depression:

Elevation is mainly by masseter, temporalis, medial pterygoid.

Depression is mainly by suprahyoid muscles (digastric, geniohyoid, mylohyoid) and gravity.

Lateral pterygoid assists in depression only indirectly by pulling the condyle forward, but its primary function is protrusion.

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