The omohyoid is a digastric muscle with an intermediate tendon that passes deep to the sternocleidomastoid, held by a fascial sling to the clavicle. This tendon divides the muscle into an inferior belly (from the scapula) and a superior belly (to the hyoid), and serves as a fascial anchor for the internal jugular vein.
The intermediate tendon of the omohyoid is a useful surgical landmark in anterior neck dissection, separating zones of the neck. An enlarged or displaced omohyoid tendon can be mistaken for a lymph node or soft tissue mass on ultrasound. Omohyoid syndrome, a rare condition, involves snapping or pain from the intermediate tendon catching on the clavicle.
Painful snapping at the omohyoid intermediate tendon caused by the tendon slipping over the clavicle during head movement, producing an anterior neck lump that moves with swallowing.
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