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Sternocleidomastoid muscle. In human anatomy, the sternocleidomastoid muscle (/ËstÉËrnoÊËklaÉªdÉËmÃ¦sËtÉÉªd, -nÉ-, -doÊ-/), also known as sternomastoid and commonly abbreviated as SCM, is a paired muscle in the superficial layers of the side of the neck. It is one of the largest and most superficial cervical muscles.
As you look at the two muscles it will help to realize that they originate on the border of your scapula (shoulder blade) and insert into your shoulder and upper arm. Insertions always move toward the origination, so this muscle pulls your arm down from a raised position. However, if the muscles are tight, you arenât going to be able to raise your arm. These two muscles ended up being a major part of the pain and debility I experienced when I had frozen shoulder.