Everybody has two of them and they’re very often the storage point for stress and strain. Say hello to your Sternocleidomastoid (SCM) muscles. The muscles are attached to the base of your skull just behind your ear and extend down your neck and toward the front of your body and attach to the clavicle (collar bone).
What does the muscle do?
The muscle is responsible for rotating and flexing your neck. The SCM also helps you breath in (inspiration). Interestingly, while the muscle seems to store stress, it rarely hurts. Instead it just causes strain on other muscles and tension can present itself in the form of headaches, facial pain, jaw tension and even dizziness, blurry vision and muffled hearing.