How do you test the sternocleidomastoid muscle?

Test the right sternocleidomastoid muscle by facing the patient and placing your right palm laterally on the patient’s left cheek. Ask the patient to turn the head to the left, resisting the pressure you are exerting in the opposite direction.

What happens when the sternocleidomastoid muscles contract?

When just one SCM muscle contracts, it tilts your head to the same side (called the ipsilateral side) to which the muscle is located. For example, the SCM on the right side of your neck tilts your head to your right. One SCM can also turn, or rotate, your head to the opposite side.

How do you contract sternocleidomastoid?

Contraction. The signaling process to contract or relax the sternocleidomastoid begins in Cranial Nerve XI, the accessory nerve. The accessory nerve nucleus is in the anterior horn of the spinal cord around C1-C3, where lower motor neuron fibers mark its origin.

How is sternocleidomastoid pain diagnosed?

Sternocleidomastoid pain symptoms You can feel SCM pain in a few different ways. Your neck, shoulders, or upper back may be especially sensitive to touch or pressure. You may experience pain in your sinuses, forehead, or near your eyebrows. Dull, aching pain may be accompanied by feelings of tightness or pressure.

What is the sternocleidomastoid function?

Function. Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck. When acting together it flexes the neck and extends the head.

How many Sternomastoid muscles are in the human body?

The sternocleidomastoid muscle (SCM) is one of more than 20 pairs of muscles that act on the neck. SCM has a dual-innervation and multiple functions.

What is the Sternocleidomastoid responsible for?

It is a long, bilateral muscle of the neck, which functions to flex the neck both laterally and anteriorly, as well as rotate the head contralaterally to the side of contraction.

What movement does the Sternocleidomastoid produce?

What is sternocleidomastoid syndrome?

The sternocleidomastoid is a large muscle near the front of the neck. It extends from just under the ear and jaw down to the collarbone. Pain in the sternocleidomastoid can cause neck tenderness and headaches. A person with sternocleidomastoid pain might notice trigger points along the side or front of the neck.

Can sternocleidomastoid muscle cause throat pain?

The clavicular division of SCM trigger points can produce pain over the forehead and around the ipsilateral eye, over the cheek, the tip of the chin, sternoclavicular joint and deep in the throat upon swallowing.

What is the role of the sternocleidomastoid in respiration during exercise?

The sternocleidomastoid muscle (SCM), which is responsible for the mechanical action in the majority of the head movements, is also considered an accessory muscle for respiration.

What is unilateral sternocleidomastoid contraction?

A unilateral contraction of the sternocleidomastoid muscle flexes the cervical vertebral column to the same side (lateral flexion) and rotates the head to the opposite side. A bilateral contraction elevates the head by dorsally extending the upper cervical joints. Recommended video: Sternocleidomastoid muscle.

What is the clinical picture of sternocleidomastoid disease?

During pathological changes of the sternocleidomastoid the clinical picture of the wryneck occurs (bending of the head to the affected muscle and rotation to the healthy side). A classic example for this condition is the muscular torticollis, a tonic spasm of the sternocleidomastoid.

What is the function of the sterocleidomastoid?

Sternocleidomastoid Function. In part, the neck movements produced by the sterocleiomastoid vary depending on whether one or both of the SCM muscles are working. When just one SCM muscle contracts, it tilts your head to the same side (called the ipsilateral side) to which the muscle is located.

Where is the insertion of the sternocleidomastoid muscle?

The insertion is the lateral surface of the mastoid process of the temporal bone and the lateral half of the superior nuchal line of the occipital bone. Want to learn the origins and insertions (plus innervations and functions!) of the sternocleidomastoid muscle 10x faster and easier? You need our head and neck muscle anatomy chart!