The stylomastoid artery enters the stylomastoid foramen and supplies the tympanic cavity, the tympanic antrum and mastoid cells, and the semicircular canals. It is a branch of the posterior auricular artery, and thus part of the external carotid arterial system.

Stylomastoid artery
The arteries of the face and scalp.
Details
Source	posterior auricular artery
Supplies	tympanic cavity, tympanic antrum, mastoid cells, semicircular canals
Identifiers
Latin	arteria stylomastoidea
TA98	A12.2.05.038
TA2	4406
FMA	49628
Anatomical terminology [edit on Wikidata]

In the young subject a branch from this vessel forms, with the anterior tympanic artery from the internal maxillary, a vascular circle, which surrounds the tympanic membrane, and from which delicate vessels ramify on that membrane.

It anastomoses with the superficial petrosal branch of the middle meningeal artery by a twig which enters the hiatus canalis facialis.