1. Formed of two bellies attached to intermediate tendon; origin, by inferior belly from upper border of scapula between superior angle and notch; insertion, by superior belly into hyoid bone; action, depresses hyoid; nerve supply, upper cervical spinal nerves through ansa cervicalis. (biology-online.org)
2. A muscle found in the neck, inferior to the hyoid bone (infrahyoid muscle). It is innervated by the C1 spinal nerve. (wiktionary.org)
3. One of the infrahyoid muscles of the neck. It arises from the superior border of the scapula and suprascapular ligament. Passing superomedially, it becomes tendinous to form the intermediate tendon that passes through a fascial sling attached to the medial end of the clavicle. Continuing as a slender muscle, it ascends medially from the sling to insert into the inferior border of the hyoid bone.
The part of the muscle lateral to the sling is the inferior belly. The part medially-sited is the superior belly. Omohyoid divides the posterior triangle of the neck into the supraclavicular triangle inferiorly and the occipital triangle superiorly.
It is innervated by the ansa cervicalis from the cervical roots (C1-C3).
Syn: musculus omohyoideus, omohyoid muscle
Word origin: From Greek omos meaning shoulder, giving one of its attachments, and hyoid, giving the other attachment – the hyoid bone.