Which Movement Occurs When One Sternocleidomastoid Muscle Contracts

The sternocleidomastoid muscle is a powerful muscle located in the neck that is responsible for a variety of movements. It is named after the three bony landmarks it attaches to: the sternum, clavicle, and mastoid process of the skull.

One of the main movements that occurs when the sternocleidomastoid muscle contracts is rotation of the head to the opposite side. For example, if the right sternocleidomastoid muscle contracts, the head will rotate to the left.

This movement is important for a variety of daily activities, such as looking over your shoulder while driving or turning to speak to someone next to you. It also plays a role in certain sports, such as tennis or golf, where rotational movements of the neck are necessary for performance.

In addition to rotation, the sternocleidomastoid muscle also assists in flexion of the neck. This occurs when both muscles contract simultaneously, bringing the chin towards the chest.

The sternocleidomastoid muscle is also involved in tilting the head to the side. If only one muscle contracts, the head will tilt towards the same side as the contracting muscle.

Overall, the sternocleidomastoid muscle is a fascinating muscle with multiple functions. Understanding its movements is important not only for healthcare professionals, but also for anyone interested in maintaining a healthy and active lifestyle.

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