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The sternocleidomastoid muscle (SCM) tends to indirectly get tight when your head is tilted down looking at object. The superior trapezoid and legator scapulae muscles will try to hold the weight of your head by cocontracting with the SCM. If you work at a computer, avoid this issue by keeping your monitors at eye level.

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from LIVESTRONG.COM

Signs & Symptoms of a Strained Sternocleidomastoid Muscle

The sternocleidomastoid, or SCM, muscle originates on the breastbone and attaches to the collarbone and the temporal bone on the back of the skull. You...

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Headaches, Soreness behind left and right ears and sinus pressure have been bothering me. Thought it was a cold, however, these muscles are the ones used when I was in the car accident and tucked my head. Interesting stuff....

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Sternocleidomastoideus Origin Manubrium sterni and medial portion of the clavicle Insertion Mastoid process of the temporal bone, superior nuchal line Artery Occipital artery and the superior thyroid artery Nerve Motor: accessory nerve sensory: cervical plexus Actions Unilaterally; cervical rotation to opposite side, cervical lateral flexion to same side Bilaterally; cervical flexion, raises the sternum and assists in forced inspiration.

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Sternocleidomastoid Muscles: Affects Head, Eyes, Sinus, Ears, Throat, Pain, Dizziness, Whiplash - The Wellness Digest

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