The action of digastric muscle is:

 # The action of digastric muscle is:

A. Depression of mandible

B. Protrusion of mandible

C. Side to side movement of the mandible

D. Depressing the floor of the mouth

The correct answer is A. Depression of mandible.

The digastric muscle is involved in any complex jaw action such as speaking, swallowing, chewing and breathing.

When the digastric muscle contracts, it acts to elevate the hyoid bone.

If the hyoid is being held in place (by the infrahyoid muscles), it will tend to depress the mandible (open the mouth).

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