The muscle that flexes the neck so the chin drops is the

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The muscle that flexes the neck so the chin drops is the sternocleidomastoid, which is located in the front of the neck and connects the sternum and clavicle to the mastoid process of the skull. The pectoralis major is a chest muscle, the masseter is a jaw muscle, the trapezius is a shoulder and upper back muscle, and the deltoid is a shoulder muscle, none of which are responsible for flexing the neck.

The Muscle That Flexes the Neck So the Chin Drops