The sternothyroid muscle is an infrahyoid muscle of the neck. It is a wide muscle, located underneath the sternohyoid in the deep plane of the neck.
- Attachments: Arises from the manubrium of the sternum and attaches to the thyroid cartilage.
- Actions: Depresses the thyroid cartilage.
- Innervation: Anterior rami of C1-C3, carried by a branch of the ansa cervicalis.
- Blood Supply: Superior thyroid artery (branch of the external carotid artery) and inferior thyroid artery (branch of the thyrocervical trunk).