Anatomy
Origin:
Posterior aspect of sternocalvicular joint and adjacent manubrium of sternum.
Insertion:
Body of hyoid bone.
Key Relations:
-Is one of the infrahyoid muscles (sometimes referred to as ‘strap muscles’) lying in the muscular triangle of the neck.
-Medial to omohyoid.
Functions
-Depresses hyoid bone after swallowing (deglutition).
-Plays a role in speech and mastication.
Supply
Nerve Supply:
Anterior rami of C1 to C3 through the ansa cervicalis.
Blood Supply:
-Superior thyroid artery
-Lingual artery.
Clinical
Sternohyoid protects the thyroid gland and stabilizes the larynx during swallowing (deglutition) thereby protecting the airways.
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