Anatomical Presentation of the Infrahyoid Neck Region

Description

Inferior to the hyoid bone in the anterior cervical region, the infrahyoid (strap) muscles are arranged as paired vertical bands flanking the midline. Sternohyoid lies most superficial and medial, while omohyoid crosses obliquely with its superior belly approaching the hyoid and its inferior attachment coursing toward the scapular region, separated by an intermediate tendon. Deeper, sternothyroid ascends from the posterior manubrium to the thyroid cartilage, and thyrohyoid continues superiorly from the thyroid cartilage to the hyoid, sitting immediately anterior to the laryngeal framework. Midline relationships are anchored by the laryngeal prominence and the adjacent thyroid cartilage. For teaching surface and surgical anatomy, this region matters because the strap muscles form the first muscular layer encountered when approaching the larynx and thyroid gland from the front of the neck. Their separation along the linea alba cervicalis and retraction laterally is a standard step in thyroidectomy and tracheostomy, and their bulk influences exposure of the pretracheal fascia, tracheal rings, and the thyroid isthmus. Small. Normal landmarks. Their innervation through the ansa cervicalis (C1 to C3), with C1 fibers traveling briefly with the hypoglossal nerve, also makes this a useful map for understanding postoperative dysphonia patterns when retraction or scarring affects adjacent laryngeal mechanics. Use this illustration for gross anatomy and head and neck modules, endocrine surgery atlases, or patient education materials explaining anterior neck incisions and the muscle layers traversed to reach the thyroid or airway. Anatomical accuracy verified by SciePro's Medical Advisory Board.