Omohyoid Muscle, Gross Anatomy

Description

Running obliquely across the anterolateral neck, the omohyoid appears as a paired infrahyoid (strap) muscle with an inferior belly arising from the superior border of the scapula near the suprascapular notch, an intermediate tendon tethered by a fascial sling to the clavicle and first rib, and a superior belly inserting on the inferior border of the hyoid bone. In the male neck it lies deep to the sternocleidomastoid, crossing the carotid triangle so that its superior belly passes anterior to the internal jugular vein and lateral to the laryngeal framework, while remaining superficial to deeper prevertebral structures. Adjacent strap muscles such as sternohyoid and sternothyroid sit more medially, forming the familiar layered anterior cervical wall beneath the mandible and above the manubrium and clavicles. Spatial relationships are clear. Clinically, this muscle matters because surgeons use the omohyoid as a practical landmark during cervical lymph node dissection, where its course helps orient levels III and IV along the internal jugular vein and carotid sheath. The intermediate tendon and its fascial sling can obscure or tether the internal jugular vein during venous exposure, and the superior belly is commonly divided in neck dissections to improve access while preserving nearby ansa cervicalis branches. Rarely, segmental dysfunction can present as omohyoid syndrome, producing a transient lateral neck mass that appears during swallowing due to abnormal tendon motion. Course directors in head and neck anatomy, surgical anatomy, and ENT modules can drop this plate directly into teaching on infrahyoid layers, triangles of the neck, and the relationship of strap muscles to major cervical vessels such as the carotid and subclavian systems. It also fits operative atlases, anatomy lab manuals, and patient education for planned central venous access or neck dissection, with the male skeletal context providing stable bony reference points from hyoid to clavicle and scapula. Anatomical accuracy verified by SciePro's Medical Advisory Board.