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This article refers to muscles of the feline (cat) anatomy.
For "strap muscles" in humans, please see "infrahyoid muscles." ([1])
Strap muscles of the neck are termed as such since they appear as a strap of muscle running along the neck and onto the shoulder. While they appear to be one muscle, it is actually two muscles. Originating on the nuchal crest of the skull the clavotrapezius inserts on the clavicle while the clavobrachialis originates on the clavicle and appears as a continuation of the clavotrapezius. They work together to flex the head when nodding, take part in breathing, and act in unison with the eye muscles, causing the head to turn from side to side with the eyes.
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