Anatomical Structure And Location Of The Sternothyroid Muscle

Description

Running vertically in the anterior neck, the sternothyroid muscle arises from the posterior surface of the manubrium sterni and the first costal cartilage, then ascends deep to the sternohyoid as one of the infrahyoid strap muscles. Its fibers pass superiorly and slightly laterally to insert on the oblique line of the thyroid cartilage, placing it inferior to the hyoid but directly anterior to the laryngeal framework. Medially, the paired sternothyroids flank the midline and the trachea, while the sternocleidomastoid sits more superficial and lateral as it spans from sternum and clavicle to mastoid process. Bone landmarks often included in this field include the mandible, clavicles, upper ribs, and cervical vertebrae. Short and direct. Functionally, sternothyroid depresses the thyroid cartilage and, by extension, lowers the larynx after swallowing and during phonation, making it a useful teaching counterpoint to the suprahyoid elevators. Surgeons working through a low anterior cervical approach encounter these strap layers early, then separate or retract them to expose the thyroid gland, trachea, and larynx, so recognizing sternothyroid versus sternohyoid helps orient dissection planes. Its proximity to the superior thyroid vessels and external branch of the superior laryngeal nerve makes the region clinically specific when discussing voice change risk after thyroidectomy. Use this artwork in head and neck anatomy courses, endocrine surgery atlases, or patient education materials explaining thyroid and laryngeal access through strap muscle separation in the upper thorax and neck. It also fits well in radiology teaching when correlating the infrahyoid compartment on axial CT or ultrasound with surface landmarks at the thyroid cartilage and suprasternal notch. Anatomical accuracy verified by SciePro's Medical Advisory Board.