Stylopharyngeus Detail

musculus stylopharyngeus detail

Stylopharyngeus is the only muscle in the body innervated exclusively by the glossopharyngeal nerve. It passes between the external and internal carotid arteries — a key landmark for surgical anatomy of the carotid bifurcation.

Nerve: Glossopharyngeal nerve (CN IX) — the only muscle… Blood Supply: Ascending pharyngeal artery Region: Neck

Anatomical Data

Origin, Insertion & Supply

Origin	Medial surface of the styloid process base
Insertion	Lateral wall of the pharynx — blending with the pharyngeal constrictors and palatopharyngeus
Nerve Supply	Glossopharyngeal nerve (CN IX) — the only muscle innervated exclusively by CN IX
Blood Supply	Ascending pharyngeal artery

Biomechanics

Function & Actions

Actions	Elevates and dilates the pharynx during swallowing; Elevates the larynx

Clinical Relevance

Clinical Notes

Stylopharyngeus passing between the external and internal carotid arteries is the landmark for CN IX identification in carotid endarterectomy and skull base surgery. Its exclusive CN IX innervation makes it the testing muscle for CN IX motor function.

Palpation

Not directly palpable externally.

Pathology

Common Injuries & Conditions

Stylopharyngeus as CN IX Landmark in Carotid Surgery

Identification of stylopharyngeus between the external and internal carotid arteries as the reference for CN IX in carotid endarterectomy and deep parotid dissection.