Sternothyroid - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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 (2026) Fig 1- Anterior view of the infrahyoid muscles of the neck. By TeachMeSeries Ltd (2026) 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 Frequent questions What is the sternothyroid muscle? The sternothyroid muscle is an infrahyoid muscle situated in the neck, positioned beneath the sternohyoid muscle. It plays a crucial role in the movement of the thyroid cartilage. What are the attachments of the sternothyroid muscle? The sternothyroid muscle originates from the manubrium of the sternum and inserts into the thyroid cartilage. This anatomical positioning allows it to effectively perform its functions. What is the primary action of the sternothyroid muscle? The main action of the sternothyroid muscle is to depress the thyroid cartilage. This action is essential for various movements related to swallowing and phonation. How is the sternothyroid muscle innervated? The sternothyroid muscle receives its nerve supply from the anterior rami of C1-C3, conveyed through a branch of the ansa cervicalis. This innervation is vital for the muscle's function. What is the blood supply to the sternothyroid muscle? The blood supply to the sternothyroid muscle comes from the superior thyroid artery and the inferior thyroid artery. These arteries ensure adequate oxygenation and nutrients for the muscle's activity. Rate This Article