The stylomastoid artery
enters the stylomastoid foramen
and supplies the tympanic cavity
, the tympanic antrum
and mastoid cells
, and the semicircular canals
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.