Spasms of this straplike muscle often result in wryneck or torticollis.

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The sternocleidomastoid muscle runs from the sternum and clavicle to the mastoid process behind the ear, and is responsible for rotating the head and neck. Spasms of this muscle can result in a condition called wryneck or torticollis, where the head is tilted to one side and turned to the opposite side. The other muscles listed (serratus anterior, zygomaticus, and platysma) do not directly affect the neck and are unlikely to cause wryneck or torticollis.

Spasms of This Straplike Muscle Often Result in Wryneck or Torticollis