The sternohyoid is the most superficial infrahyoid (strap) muscle, overlying the thyroid gland and larynx. It is routinely divided in thyroid and laryngeal surgery to gain access.
| Origin | Posterior surface of the manubrium sterni and medial end of the clavicle |
|---|---|
| Insertion | Body of the hyoid bone — inferior border |
| Nerve Supply | Ansa cervicalis (C1, C2, C3) |
| Blood Supply | Superior thyroid artery |
| Actions | Depresses the hyoid bone after elevation during swallowing |
|---|
The sternohyoid is divided transversely in thyroidectomy for access to the thyroid. Its ansa cervicalis innervation from below means it can be transected high and will reinnervate from below. In voice restoration after laryngectomy, sternohyoid is used as a tracheoesophageal voice prosthesis support muscle.
Palpated as the central flat strap muscle in the anterior neck during swallowing.
Transverse division of the sternohyoid for thyroid gland access, with reinnervation from the ansa cervicalis after repair.
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