The sternocleidomastoid muscle is a large muscle in the neck that helps with various movements of the head and neck. When both (bilateral) sternocleidomastoid muscles contract, the following movements occur:

1. Flexion of the Neck: The first movement is flexion of the neck. This means that the head is moved forward, bringing the chin towards the chest. This is the primary movement that occurs when both sternocleidomastoid muscles contract.

2. Lateral Flexion: The second movement is lateral flexion. This means that the head is tilted to one side, bringing the ear towards the shoulder on the same side. This movement is less pronounced than neck flexion when both muscles contract.

3. Rotation: The third movement is rotation. This means that the head is turned to one side, so that the chin is pointed towards the shoulder on the opposite side. This movement is less pronounced than neck flexion when both muscles contract.

In summary, bilateral contraction of the sternocleidomastoid muscles primarily results in flexion of the neck, with some lateral flexion and rotation also occurring.

Question

The sternocleidomastoid muscle is a large muscle in the neck that helps with various movements of the head and neck. When both (bilateral) sternocleidomastoid muscles contract, the following movements occur:

1. Flexion of the Neck: The first movement is flexion of the neck. This means that the head is moved forward, bringing the chin towards the chest. This is the primary movement that occurs when both sternocleidomastoid muscles contract.

2. Lateral Flexion: The second movement is lateral flexion. This means that the head is tilted to one side, bringing the ear towards the shoulder on the same side. This movement is less pronounced than neck flexion when both muscles contract.

3. Rotation: The third movement is rotation. This means that the head is turned to one side, so that the chin is pointed towards the shoulder on the opposite side. This movement is less pronounced than neck flexion when both muscles contract.

In summary, bilateral contraction of the sternocleidomastoid muscles primarily results in flexion of the neck, with some lateral flexion and rotation also occurring.

Knowee AI · Accepted Answer

The sternocleidomastoid muscle is a large muscle in the neck that helps with various movements of the head and neck. When both (bilateral) sternocleidomastoid muscles contract, the following movements occur:

1. Flexion of the Neck: The first movement is flexion of the neck. This means that the head is moved forward, bringing the chin towards the chest. This is the primary movement that occurs when both sternocleidomastoid muscles contract.

2. Lateral Flexion: The second movement is lateral flexion. This means that the head is tilted to one side, bringing the ear towards the shoulder on the same side. This movement is less pronounced than neck flexion when both muscles contract.

3. Rotation: The third movement is rotation. This means that the head is turned to one side, so that the chin is pointed towards the shoulder on the opposite side. This movement is less pronounced than neck flexion when both muscles contract.

In summary, bilateral contraction of the sternocleidomastoid muscles primarily results in flexion of the neck, with some lateral flexion and rotation also occurring.

What movements occur with bilateral contraction of sternocleidomastoid?

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