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). By TeachMeSeries Ltd (2025) Fig 1- Anterior view of the infrahyoid muscles of the neck. By TeachMeSeries Ltd (2025) Fig 2Lateral view of the infrahyoid muscles of the neck. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article