The sternohyoid arises from the posterior manubrium and medial clavicle via a flat tendinous origin and inserts into the inferior border of the hyoid body. As an infrahyoid strap muscle, its tendinous attachments depress the hyoid and larynx during swallowing and phonation.
| Muscle | |
|---|---|
| Attachment | Posterior manubrium and medial clavicle (origin), inferior border of the hyoid body (insertion) |
Depresses the hyoid bone after swallowing
The sternohyoid tendon is at risk during anterior cervical spine surgery and thyroid procedures, where the strap muscles must be retracted or divided. Inadvertent division of the sternohyoid insertion may impair laryngeal depression and affect voice quality. The infrahyoid muscles are detached from the hyoid during total laryngectomy and in hyoid suspension procedures for obstructive sleep apnoea. Hyoid bone fracture can avulse the sternohyoid attachment.
High-energy neck trauma or manual strangulation producing avulsion at the sternohyoid insertion onto the hyoid, associated with dysphagia and anterior neck pain on swallowing.
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