Stylohyoid Detail

musculus stylohyoideus detail

The stylohyoid splits at its insertion to surround the intermediate digastric tendon before attaching to the hyoid. This split is the unique anatomical feature that distinguishes it from other hyoid muscles.

Nerve: Facial nerve — stylohyoid branch (VII) Blood Supply: Occipital and posterior auricular arteries Region: Neck

Anatomical Data

Origin, Insertion & Supply

Origin	Posterior surface of the styloid process of the temporal bone
Insertion	Body of the hyoid bone — lateral aspect, splitting to surround the intermediate digastric tendon
Nerve Supply	Facial nerve — stylohyoid branch (VII)
Blood Supply	Occipital and posterior auricular arteries

Biomechanics

Function & Actions

Actions	Elevates and retracts the hyoid during swallowing; Elongates the floor of the mouth

Clinical Relevance

Clinical Notes

Eagle syndrome (elongated styloid process) compresses or irritates the stylohyoid as it runs from an elongated styloid process to the hyoid, producing throat pain, dysphagia, and referred ear pain. Styloidectomy reduces the styloid length, releasing the stylohyoid.

Palpation

Not directly palpable but its hyoid attachment is palpated during swallowing.

Pathology

Common Injuries & Conditions

Eagle Syndrome — Stylohyoid Irritation

Elongated styloid process irritating the stylohyoid muscle and adjacent structures producing throat pain and dysphagia, managed by intra-oral or external styloidectomy.