Sternothyroid Muscle

Description

Running deep to the sternohyoid, the sternothyroid muscle forms a medial infrahyoid strap that rises from the posterior surface of the manubrium sterni and adjacent first costal cartilage to the oblique line of the thyroid cartilage. Its fibers travel superiorly and slightly laterally, ending inferior to the thyrohyoid muscle and just lateral to the midline attachments of the laryngeal framework. Anteriorly, it sits beneath the superficial cervical fascia and platysma, while posteriorly it relates to the thyroid gland and the visceral compartment, with the carotid sheath positioned more laterally. Clean, paired symmetry. Sternothyroid anatomy matters whenever the anterior neck is opened to reach the thyroid gland, larynx, or proximal trachea, because retraction or division of the strap muscles governs exposure while also influencing postoperative dysphonia and swallowing mechanics. During thyroidectomy or tracheostomy, appreciating the muscle’s insertion along the thyroid lamina helps you anticipate how inferior laryngeal structures are tethered, and why edema or hematoma in this compartment can restrict laryngeal elevation. This view also supports teaching the functional distinction between sternothyroid (depresses thyroid cartilage) and sternohyoid or omohyoid (depress the hyoid), a point that clarifies laryngeal movement during phonation and deglutition. Use this illustration for head and neck anatomy courses, otolaryngology and endocrine surgery atlases, and patient education materials explaining strap muscle handling in thyroid surgery for a male patient. It also fits radiology teaching files when correlating superficial infrahyoid layers with axial CT or ultrasound of the anterior neck. Anatomical accuracy verified by SciePro's Medical Advisory Board.