The sternothyroid is the deeper strap muscle, attaching directly to the thyroid cartilage. It is the key muscle for laryngeal descent after swallowing.
| Origin | Posterior surface of the manubrium — below the sternohyoid origin |
|---|---|
| Insertion | Oblique line of the thyroid cartilage |
| Nerve Supply | Ansa cervicalis (C1, C2, C3) |
| Blood Supply | Superior thyroid artery |
| Actions | Depresses the thyroid cartilage and larynx; Stabilises the laryngeal framework during speech and swallowing |
|---|
The sternothyroid is the landmark for the middle thyroid vein in thyroidectomy. Its oblique line attachment to the thyroid cartilage is the reference for the cricothyroid space. In open laryngeal surgery, the sternothyroid is reflected to expose the laryngeal framework.
Palpated deep to the sternohyoid in the anterior neck.
Sternothyroid attachment to the thyroid cartilage oblique line serving as the reference for middle thyroid vein ligation during thyroidectomy.
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