Which muscle depresses the hyoid bone?

Which muscle depresses the hyoid bone?

• A. Omohyoid
• B. Sternohyoid
• C. Sternothyroid
• D. Mylohyoid

Answer: (A)

Depressing the hyoid bone is performed by the infrahyoid muscles that pull the hyoid downward after it has been elevated during swallowing or mouth movements. The omohyoid fits this role because its action pulls the hyoid downward (and slightly backward) as it contracts, helping return the hyoid to its resting position and stabilize it during swallowing and jaw movement. The mylohyoid, in contrast, is a floor-of-mouth muscle that mainly elevates the hyoid and the floor of the mouth, not depresses it. The other infrahyoid muscles also contribute to lowering the hyoid, but among the given options, omohyoid is the representative depressor of the hyoid bone.

Depressing the hyoid bone is performed by the infrahyoid muscles that pull the hyoid downward after it has been elevated during swallowing or mouth movements. The omohyoid fits this role because its action pulls the hyoid downward (and slightly backward) as it contracts, helping return the hyoid to its resting position and stabilize it during swallowing and jaw movement. The mylohyoid, in contrast, is a floor-of-mouth muscle that mainly elevates the hyoid and the floor of the mouth, not depresses it. The other infrahyoid muscles also contribute to lowering the hyoid, but among the given options, omohyoid is the representative depressor of the hyoid bone.